Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1dedcc86d88096…

MALICIOUS

PDF

139.5 KB Created: 2021-05-19 03:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 72d3fbacc9ed11281c40997427e4c737 SHA-1: 68b1498ae1c528fba655f01d7cf369ead81934ff SHA-256: 0f1dedcc86d88096caac2dc7782167adf232acae2e99ace89516f06b59cd1dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no clear user-facing text is present to indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/0jamnk11r4t4h9h65hc10vip1h/pifojaxikileragosikekufof.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea9fe9cca---66241926498.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0dd660400d316ab1636294729efb7988/bekeruwegopobexa.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/875a5e4dfd5d9f85727283fbd54650e6/fitopigefeti.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d54ea2c8---55917082230.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/20d2335553fab429b714ff0a7b510def/duduzodepeta.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7bf8d5748a3b7b6bfd43d38c3de8ac01/51747419562.pdfIn PDF document text
    • http://aplus.to/userfiles/file/bekegi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/paziriberoxel.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/bb0ad38fd5db399b1c96a90bb38d84ff/dokiwonuf.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1qk8rb98tgu2udpbqr4un1e7q2/bepapusumabuxi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/qhlij5mi5es5ldloqp8npffr3n/83532616298.pdfIn PDF document text
    • https://activepymes.com/pub/file/wometaroluro.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868d54c10e8---66326883798.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=artificial+intelligence+a+modern+approach+solutions+manual+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 17

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_017_off0001d975.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D975 19380 bytes
SHA-256: 9564b241302e158315f08a0b9c21d36b3ff3c44ac475cc585310e34d7b103d38
font_00_sfnt_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 7916 bytes
SHA-256: 4fca73d47fa94a6ad668c0f4434483fdc2f54e6be5ae77a011c3735f5dfefd3b
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 10100 bytes
SHA-256: c3217b4e32c4cc84342c08d4d5956f2c830c0a604d1360dede729a6ee0a3d747
font_02_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 5556 bytes
SHA-256: 7b799b15eac4827507f9e6913b16d40b16de5af60ac0045ac9783b0ab19d041e
font_03_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_04_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 4140 bytes
SHA-256: 7073f777ec002e82a856420936458262fa3cc3b4ee0437ed56f01fa51c4379d2
font_05_sfnt_off0001416f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416F 3048 bytes
SHA-256: 2f58f42410b60611991c12283e964e03297a95500ca09b14f4d605296bc50bc4
font_06_sfnt_off00014d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D78 4544 bytes
SHA-256: 53570b1addc227c644bcbe5fafcce3e1ca8a5779b7722260ef5244079f464722
font_07_sfnt_off00015b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7D 2328 bytes
SHA-256: 864cbe2c6973b44d2b71e19ffbffb2328dcb3759b07ceb43c11d5a372fc4956d
font_08_sfnt_off00016638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16638 2604 bytes
SHA-256: 0e4b190990c22158f359a0de2485c61736e93a484cfb226f63bccb9bc1da1b2f
font_09_sfnt_off00017157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17157 2108 bytes
SHA-256: d117309382da938f7dffedc42f90dd4217b4d540d75629b80669d975ecbc171e
font_10_sfnt_off00017af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF6 3840 bytes
SHA-256: 5b8e8035f8940535bfb5f3d78de7d5c45dbc51c905faa5d9788b8fc152e96872
font_11_sfnt_off0001890f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1890F 4336 bytes
SHA-256: 87016e8933cc862d1d188edfbee698abcff8178ed3d6b510b61737ee02f60284
font_12_sfnt_off000196af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196AF 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_13_sfnt_off0001a698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A698 17836 bytes
SHA-256: 71237534968a231c58e41080a2858e4f3f1d7ae35ea940ca5a8c948fa6ed78d5
font_15_sfnt_off0001fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAE3 3612 bytes
SHA-256: f0a2204899d1e3318a6bd81c872bf71f9687a1eb2abd97e43f363b8beb464341
font_16_sfnt_off00020902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20902 4216 bytes
SHA-256: cf1f64e2e40b673e905a7144f0f78914353b51ead6a82b3d8aeaa2f16fa670a9

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