Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fb4a9c026b177b…

MALICIOUS

PDF

39.0 KB Created: 2021-09-07 15:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4c4f7a66a80d6d8b463f46acf3fa832 SHA-1: 7cb6a1f649277366c3bea4f81e8065dcc105a536 SHA-256: f4fb4a9c026b177bc6e0543e380ca31382ff369f534eb4e4b124410aaa46c802
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It employs an image-only lure, typical of phishing, with multiple links pointing to compromised WordPress sites and other disposable hosting. The document's structure and embedded links suggest an attempt to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

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 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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e7849e577ea0080bd605708b04e360a7/nexojotelin.pdf In PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gudesev.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/pexasegomebagapudifoleda.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/83514065512.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/divonukup.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4e01c7ff99c5bb967838181c4933df9/12929713189.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/r0vl7vc2b7ta24ugoqij77piag/96474551229.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a288e151750---jetazefa.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d7852843581e5b63790d85e129e91c22/69123634543.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210731000124.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609107594bf3b---rowomu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16103e84788d90---rekegobiwafagagefemudun.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/91623318773.pdfIn PDF document text
    • https://proxus.nl/file/30424115524.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a68619b40fb7d23a1739c8427baec28e/mowotoxor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=samsung+hw+m360+manualPDF link annotation

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