Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cead660e1c17544…

MALICIOUS

PDF

62.3 KB Created: 2021-09-15 13:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cddbcdcbb4c8b4576b0b84d387ac95b8 SHA-1: 3c3ca685b4d7968386557b0da7521ca454b5e90e SHA-256: 3cead660e1c1754419e8c23906d41a53d6f7393939ea4826384cefe8d3934f63
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file is identified as a phishing lure due to its image-only nature and the presence of a link farm. The document contains multiple URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7100

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 62 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://wastran.ru/uplcv?utm_term=filmes+online+360p
    • https://satellietgroep.nl/userfiles/files/nudetogexupolupekijanu.pdf
    • http://abnicum.com/files/file/89189851357.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a2cab5d9b86b7b291a75b3c90e54dd96/49622524118.pdf
    • http://maychamsocda.vn/images/userfiles/file/1519199723.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/73476b2969213ec2db486426bbaaf2e6/37796481501.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613db49d5d86a---xigajazeretaras.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ede2111331fef9a14feb6d1792816d46/majisut.pdf
    • http://pretaporter-pegah.com/userfiles/file/pilupufomefataxu.pdf
    • http://xindeshiye.com/uploadfile/file///2021090916265847.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///nobefokud.pdf
    • http://vizesblokk.hu/files/file/15100626057.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141738c8d52d---zosuwewabajasufosed.pdf
    • http://cc-loges.com/uploads/file/89505190684.pdf

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