Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fda1bf331e1ac2…

MALICIOUS

PDF

39.3 KB Created: 2021-07-01 19:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b81aebc1e18d1f0ba411ca825666d507 SHA-1: 3e512ba826fc3e981f5a8c8ba7e8777d50514153 SHA-256: 70fda1bf331e1ac215f28fb90b0ad570a51272e6fc44f27caf921c83ca65a492
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a likely intent to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

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 39 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://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/2khevgvtip7hno4mbgukpcvtsj/zovulefadalapataguvedule.pdf In PDF document text
    • http://arcenevents.nl/site/upload/files/vunejubonakibijigukisura.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/bf17q993qe2o59hmdrrs5ci1c6/99202263717.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/ledebiwijulelifa.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/66324722251.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624623877mijomivikiwi.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/2578175147.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097b4ece4844---29655606914.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/puzepavomisifinomopuz.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9c1eff8b033ee5edd18dc625d8014e4b/3908954813.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf5e0ac02---wezebager.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/notemefewonerawepuke.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d1b115a5187e7390bfb52ff92ffb5688/bugukujeveked.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/fc7c4a6a01ed12f18520f4c74cccea06/36034148078.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/35704672741.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=linear+graphs+worksheet+with+answersPDF link annotation

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