Malicious PDF — malware analysis report

Static analysis result for SHA-256 a553afa4895ba1cc…

MALICIOUS

PDF

83.8 KB Created: 2021-08-03 15:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75bacff43afe801c54ac7e6cce712367 SHA-1: d8aa0435dca384804f131a3f445496b0eee408f7 SHA-256: a553afa4895ba1cc5774379ffbf4567203568ea62e64b8acd23e9e26167ca011
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609996e967c8c---84142604607.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff07ce353d---58254187692.pdf
    • http://broadmoor77.com/clients/39738/File/73223657029.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d19a0b8978d---8906434175.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a8ad8648b84871a96567deafe3b59ac3/juwowove.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ac5d504110fd25d5b5344109740bb2c4/wudonidawipi.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/7mub3i3p141b9epoqqn9k2ol6k/85957464233.pdf
    • https://clearpatth.com/userfiles/file/vajudikusiwukakini.pdf
    • https://suprizpin.com/calisma2/files/uploads/tovadizanege.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba56ef556---watifetabo.pdf
    • http://mrbossamktown.com/uploads/files/97269627229.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7ageoj537mnrllt9ijmq2ottn0/suvede.pdf
    • https://classconnbio.com/img-jacson/files/nuweguzogirewigewama.pdf
    • https://heyratacademy.ir/file/486096322.pdf
    • https://benqmusicworkshop.com/fupload/file/nokuluravimad.pdf
    • http://taitung-house.com/CKEdit/upload/files/80442312768.pdf
    • https://scalping.ir/data/files/file/84098238830.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/02b65ec2f707a403233cef0f4e68516e/daxukij.pdf
    • https://parvazyab.com/basefile/api203/files/12887356036.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/tujepudopevedabowikuxan.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b93c09444c582ae9f115ca23f5d71034/33445070517.pdf
    • http://brukbet.com/user_images/file/kokus.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/rimizefefirumuxireropoxi.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0a2sqfr3vml9inumn1c4ojkjb4/6855045515.pdf
    • http://stellamaris.cz/userfiles/83479175853.pdf
    • https://cbconsulting112.ca/userfiles/files/wovavunozuda.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750e7920f27---kufobunawelivoverojo.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45e7d1498---35067671477.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+reset+landis+gyr+meter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 16792 bytes
font_01_sfnt_off0000fc9b.bin
31f6e7221b287288cac90207df3b405f287f3f0f41efd1c8aeb64e95d24ee680		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 10780 bytes
font_02_sfnt_off00011537.bin
897b1b2b10fe8b41043eb06d87fc3a32f6053c80a7b8f127455b178bed66c3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 16612 bytes

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