Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7039b77f56bbbf…

MALICIOUS

PDF

53.9 KB Created: 2021-09-02 16:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 379120da64cb94c11e80acd6f8121e4f SHA-1: 10fd3c0e9bcf6deb61b947bfdfa440777337e873 SHA-256: 8f7039b77f56bbbfa701e4af8b3ff22caaf62e6430eaa6aedf85080df572f0ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO manipulation to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5367

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=pdf+deep+learning+ian+goodfellow PDF link annotation
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e9cada4ab---17771708678.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/95778326136.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/fefufuwofuzozeserojodukiw.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/4650144201.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/44490901235.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa47d844d39---kenusevekufibejosog.pdfIn PDF document text
    • http://guitarenko.fr/img/files/mipapunitegozumuki.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/81791720243.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d2f4015d5e6e00364aca59d7f83beda1/67890740973.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107281548028893.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076d16763eb4---110804171.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/32455056414.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610663948a2d7---zabave.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/58866125784.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/22510565967.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/zarasexupesiwevup.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/768e6700faaebd06b45b199dd0804500/4899134924.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k6lil4ano2m5m7q7oa2mhf7ja4/64565498403.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/49274614609.pdfIn PDF document text
    • http://charivne.info/images/file/88513694178.pdfIn PDF document text
    • https://baongochoa.com/upload/file/pajifoxeduwosorixun.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/refapukivisan.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/g6jr7fd1ngcp569h7shdha3eoo/42169095824.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/45557920220.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/jagidedizijexifisogo.pdfIn PDF document text
    • https://tepihtrava.rs//files/51184397475.pdfIn PDF document text

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