Malicious PDF — malware analysis report

Static analysis result for SHA-256 b750cd3c493b3ec9…

MALICIOUS

PDF

80.0 KB Created: 2021-08-12 01:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a5f9fe8b950be3e7b707c2986075dcb SHA-1: a8158e352876d7c7575465dc4bd0f72011d85a14 SHA-256: b750cd3c493b3ec9f36687aec4c54fe4d233beea0984e6cfd81fd98788e5f5b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised websites or link farms, suggesting it's designed to redirect users to phishing or malware hosting sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating a pattern of using SEO-manipulated links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8067

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=intermediate+accounting+ifrs+3rd+edition+pdf PDF link annotation
    • http://stellarp.com/userfiles/files/58255740213.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/22396733047.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5209681a79---ruluzuwaz.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/qgif8fpffgpd8d56gst56gv5gp/37810558807.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711fc13cd59---xovazogot.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2l89g4lft892mnlk16a6k04k6m/fipasogewuse.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/7958622104.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/66008472873.pdfIn PDF document text
    • http://soupworld.de/upload/file/30826379883.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4682a72365717d047acf45e0123a9784/vagona.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082c21db6f90---mefukanokugar.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/48d618630ad05ff484ffa6b05942d0cd/sivinukejomap.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/75764327034.pdfIn PDF document text

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