Malicious PDF — malware analysis report

Static analysis result for SHA-256 796208a3ba258759…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 11:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93157df0c3ec61372ae3d1170e8bdcbf SHA-1: 064fadb9278e422412f07940ff114e7fbba5ca08 SHA-256: 796208a3ba258759d54b991c2df4a8a302e621678294014f96837be13545854f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=persona+4+trophy+guide PDF link annotation
    • http://bubb.cn/up_file/file/jejoguliguzike.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c2f22af---nimenuwediritones.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/rakesikibesigaranoxejuku.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/54647602614.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/4751039383.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/dikofolo.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161339722742c3---67529754113.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fekenegiwatebovelisa.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/77138279533.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/xifojog.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130655e0dac1---94083152936.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/33979571559.pdfIn PDF document text
    • https://citronel.com/userfiles/files/gupifelafosafomujam.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/4734067281.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/siludojabir.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137583525a7f---41163566503.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b66169bd542cbe8870f3c7b1777781ac/93564756959.pdfIn PDF document text
    • http://nemochem.cn/upload/files/81652115649.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/zovegenivojizulomulofajo.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/sinolezozumevekopatixatan.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21090417031817742425n0ga.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/lefukodaliwax.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/jifog.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/24133333174.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/kopatubamusasunefisu.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 10920 bytes
SHA-256: f902c294b33d0b4986f8c38ccbe4e4d9ba15c3a8ed4cdb792443f8553f516be0
font_02_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 17772 bytes
SHA-256: a12dda4fab2c14ce498588ba34c51dcc5e680dabf7637600cbdcc44e2c3c8199

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