Malicious PDF — malware analysis report

Static analysis result for SHA-256 072d265b50a2b69c…

MALICIOUS

PDF

54.5 KB Created: 2021-06-13 20:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbea508aaea70c560fb605e69d1abca0 SHA-1: ea602dee4f1daaef7f6d8ca1f54b010a5b82bec7 SHA-256: 072d265b50a2b69c77b9b7ad82fc34f1ffab59fff6c3e36f7218e9dbbaa1d39e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure, likely containing a screenshot that hides a clickable link. Several heuristics indicate it's part of a link farm hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5549

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 54 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://archism.ru/uplcv?utm_term=check+grammar+and+sentence+formation
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hag4upb56snk64d679ngqvm9j5/91079083059.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/32168751648.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/raap2a7jprs0ugqpg62e30mj25/95116203107.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/742b6fc8a13ddbbaae7e3c4dad69c1ff/35943094551.pdf
    • https://yingzhaoliuart.com/upload/file/woludikotokov.pdf
    • http://phantasos.org/userfiles/file/20700140702.pdf
    • https://betenagro.com/sites/default/files/file/zolefoxirodikamaduzonun.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b93bcd884---romusixari.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160970827e6d1f---perirotejevubit.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1d8c715095325ceb67746441174666d9/pinonewofux.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ce7007f0---kenileworunolopepaxe.pdf
    • https://majorsagilekvaros.hu/uploads/file/47777404055.pdf