Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f49ca0287f69a0…

MALICIOUS

PDF

75.3 KB Created: 2021-07-31 02:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4cfe40077c924ba5f15550407855a15e SHA-1: 1452e74dc17241c3ca63b0e86f57d5e60391e13f SHA-256: b8f49ca0287f69a0be27dbd0712ebe4979a378b6c940ca586ec5ccff493d09b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common attack pattern for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://egf.tw/test2/images/file/banulivasosuti.pdf In PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/46459074103.pdfIn PDF document text
    • https://businesslife.com/content/file/60680217486.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883448b88db---31458428385.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/51255728886.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072db1153ab1---5907538382.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/fcesscuj75l88k2579g1fdab52/68918475593.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/liwozinewobojidabomuzirur.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a0e13bf4---98575114314.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f246d78df2---vixiropoj.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/38802279766.pdfIn PDF document text
    • https://noddy.nu/images/file/47876677885.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/87524795638.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/74f4c9ccd3dbb344a5e171993ba05b64/63761029678.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1d563ed3a00f5552a0a9ebe7ea110680/22917327317.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210624124859_0oy3ok.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc22c1e9d1---sisuxujavagiked.pdfIn PDF document text
    • https://irantruck.ir/data/file/93985848265.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/423f5b0a281ba80951e334cac8bc4b6b/jifixapix.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a77e39711---25428394331.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/1485599059.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j7u139u1kjk3nos07t7hku6qk9/90892126174.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/r4dq428n4sgmc2j3see9adfmm7/roxopoliwawiz.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7530c9da01de4204fc3aab5731dde5aa/10809897773.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/dowepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=piazzolla+verano+porteno+guitar+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16F 16896 bytes
SHA-256: d9b103dd65938c4ec0979fdcaac657ea655dd9a505394c93ac86fdd5e1634399
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 10732 bytes
SHA-256: b058f141f354eebe27ad4e58dd094a585fc74308cc50fe7d5a783562a814d227

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