Malicious PDF — malware analysis report

Static analysis result for SHA-256 1642cc0ad80e9f14…

MALICIOUS

PDF

37.5 KB Created: 2021-09-04 06:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80f054ce6ac8c2b34d24a84cfab20e87 SHA-1: bc78bd0ed98b1ffc51eef79c673c7786897ac21d SHA-256: 1642cc0ad80e9f145da25062bc8c7019236988fae16e95c42276142b71ba27e1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristics indicate it's designed to resemble a legitimate document but contains multiple links pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The ClamAV detection and ML classifier strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9619

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 37 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 http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c0da4c13---17796375131.pdf In PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/35090724051.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c5ef7f89a---dawenesigevuxi.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/70528383472.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/56253170613.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/momigewuvubajetixozog.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vebubofigowedorage.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d63003cd9---kajibobapugojuko.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/jaxaw.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=talmud+pdf+na+srpskomPDF link annotation

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