Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdafb3d2ca4b1a3…

MALICIOUS

PDF

38.7 KB Created: 2021-09-21 05:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5979d302ab83c49e5c74deb18ed60e83 SHA-1: e0fbea5f574023751c468324944dc06aded162c9 SHA-256: 8cdafb3d2ca4b1a346af9833e0fe28f960361919f50c030317152e8f3b9f6515
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable link. The link farm points to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature, likely as a trojan designed for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

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 http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc33b879---29842079094.pdf In PDF document text
    • https://archielectronics.com/userfiles/files/32030279934.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/51969598856.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/13864828504.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68233123928.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/60272934916.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/45004730307.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rojugu.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/16847155754.pdfIn PDF document text
    • http://cx-gl.hu/images/files/63201731505.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/5892159402.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/71f3b5b3eabe9ff237e6e90c1dad5f49/10177871074.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/karifov.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/40443459616.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442cdf0401c---35036231589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=aoc+a2472pw4t+24+inch+ips+android+touchscreen+all+in+onePDF link annotation

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