Malicious PDF — malware analysis report

Static analysis result for SHA-256 7271e4b070eed38b…

MALICIOUS

PDF

54.0 KB Created: 2021-09-16 14:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81d303d7be0e93128eb276f846407c0e SHA-1: b817f029321eb708721772186c30eca3d7285313 SHA-256: 7271e4b070eed38b1b5ce1670e2be916159c70093a2cdcfe11462c309d3587f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

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://medvor.ru/uplcv?utm_term=best+remote+desktop+app+for+android PDF link annotation
    • https://avukatwebsitesi.trakyasoft.com/upload/files/badeg.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0ef17f8b71ac31c0406edc4d16f6c2e0/wisuzixofitepiwuno.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/laleretixefuvixe.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210910131658.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/ritomez.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/15071309802.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/58304267022.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/mivigan.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6f3b08b722f39b86680a8548e8865478/65551520915.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/rulovupagemuxufa.pdfIn PDF document text
    • http://status.cz/UserFiles/File/xexuzupumaledunujo.pdfIn PDF document text
    • http://vuason.vn/upload/files/sigimadufe.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/74ea0d7a25b00a5d94f4d1dc5e25ea29/5099257685.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/37802158273.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3763c1297---kutuxadale.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/11433846051.pdfIn PDF document text
    • http://cochemical.com/upload/files/25230823865.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lq1bac5hsfdkkni1u5n6ug76ms/84365627895.pdfIn PDF document text

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