Malicious PDF — malware analysis report

Static analysis result for SHA-256 994e1cfae754fc56…

MALICIOUS

PDF

50.4 KB Created: 2021-06-15 22:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06c00dc9e6a368fe9bd55e1b50729e7 SHA-1: 19865d9add1161acbf6dedf1188e8cc0cb9b2022 SHA-256: 994e1cfae754fc56006c180120cc7ab8e3bc66a12dc86c20c27575d0112cade7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

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 50 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 https://catamma.ru/uplcv?utm_term=kettlebell+arm+and+back+workout
    • http://meble-tk.pl/userfiles/file/vukefebolukuna.pdf
    • http://fzcce.com/aimgs/uload/files/33627391908.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160849ef52a4c1---14911263286.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/hb7st0k2vjlmqr2nrb1hu0egj7/puvudumuwemupa.pdf
    • https://rpdev.org/ckfinder/userfiles/files/xibedaxut.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ab8d146d---suwideporesagurafideto.pdf
    • http://goref.ru/files/file/fikijo.pdf
    • https://securityguardsupply.org/php/uploads/file/lazelajepotivokuxiset.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608700ab5df75---sujiwitogudado.pdf
    • https://usdcp.jp/user_data/userfiles/files/79476454215.pdf
    • http://akicgiyim.com/userfiles/file/69856373239.pdf
    • http://brilspa.ro/userfiles/file/%5C/zajagirobezexubarifo.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e9309e0f---pexegurawigotas.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/zufizilinariwaditiro.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a62876813cc---95466299729.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ml3rka24br92ch03q32vnqbqdq/65247804029.pdf
    • http://pro.ovh.net/~tribuene/images/banque/file/genam.pdf

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