Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8c53286e03a1b5…

MALICIOUS

PDF

46.0 KB Created: 2021-09-19 19:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcbe41e9563de5f817f5ae6231193724 SHA-1: 217207f09968d1982875e981ac9f668d9496b040 SHA-256: 3f8c53286e03a1b59a816114a1c7ac23cd040f08c527af2663de0c65243dde65
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7521

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 46 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6d004d985eed04f4017038cc68ec2765/wexexuzimafavit.pdf
    • https://jobtiara.com/files/files/85018408367.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/438e55fa5673b86d71228d7802d3d358/63551321813.pdf
    • http://wellgroup.cz/UserFiles/File/40435521528.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/42604169046.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e910435153---kamilomamajesabikofosir.pdf
    • http://opusincertum.it/userfiles/files/fowerisazekowapegimogal.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/fuxurepirarukepizesiraxo.pdf
    • https://volnynaklad.cz/data/file/pitus.pdf
    • https://imaggu.com/ci/userfiles/files/mowukuxaxexu.pdf
    • http://khaskhaan.mn/uploads/userfiles/files/86503089842.pdf
    • http://orderkai.com/uploads/files/wowujamovikepitafo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f309df2307---55509562284.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/93745a72654c644e3c1cf2964074ec67/7352027807.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/3741809755.pdf
    • http://sarkar.ie/userfiles/file/27266158716.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/95078743080.pdf
    • http://fohow77.ru/upload/file/bodufaz.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/pivevapekidejexut.pdf
    • http://www.neoneofitou.com/ckfinder/userfiles/files/5041461471.pdf
    • http://fivelscope.net/fckimages/nasudefuxugudakupimog.pdf
    • http://sns-russia.ru/userfiles/file/36525118883.pdf
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/47201505809.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=legion+online+movie

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