Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c8b550377f4254…

MALICIOUS

PDF

38.1 KB Created: 2021-06-05 19:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ff18055c67efa5c2b5b99753c285aec2 SHA-1: 517d7230f034694e18a8ecb16522952590164654 SHA-256: 41c8b550377f42541c76314d4de7ad391bf3b153b30b4335d49fdfa80f7b8888
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as a phishing lure due to its image-only content and embedded action triggers, a common tactic to deceive users. The numerous external links, many pointing to compromised WordPress upload directories, suggest an attempt to redirect victims to malicious sites. While no specific scripts were extracted, the PDF structure and heuristic firings strongly indicate a phishing campaign, likely involving spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6440

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 38 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://infrive.ru/uplcv?utm_term=livro+modernidade+liquida+bauman+resumo PDF link annotation
    • https://baxsporthorses.com/userfiles/file/27419606405.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/9023940600.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/be93b996716f9e56aa49a5e755097c44/37699388363.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/qv7lgu28qj9onkrq7vshrtqtm3/gatevebovuduzivina.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16083845370dc5---39773938015.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c321a9384f---jejujetesigeridafeta.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886dce7b15e---rufanulipuxewepezex.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/tuujd5pmi6mif22ftf4epko3ea/65168224327.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4c2532aafef6d632ebda3d02e238c7f3/20385474314.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4ac1222d25959b6b28d3f9e5a683102b/18908201351.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/f1533ff08100653606bea96ba395f807/2In PDF document text

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