Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d43f9c047f0c51…

MALICIOUS

PDF

54.3 KB Created: 2021-06-13 01:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4a0cea39a1e9ad178aea745afba49470 SHA-1: 9663dabd440b0c6b5516aa48ee7aad3979089c94 SHA-256: b6d43f9c047f0c513f59a197f78561b8223629f40920fc61f913abdfd232bb06
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of using compromised CMS uploads and disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6084

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=gta+sa+download+link PDF link annotation
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/89k1be0gu0c4gp4uosf6ots418/rawarogubu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608940b500b13---zibigejegiwofelidoluf.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f8cb839---16478661407.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/38d2ede83109017d0fe5689cd98c2b68/87647843564.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/67333794196.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/47351593722.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/kaas3jlpl3km2neh3dj6lcta4v/gejaxabufedutaxudoxujawej.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/50423535713.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b04fdd2cadc---16417808163.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608681a56835b---43737533181.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xomusox.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/topqebg45g4feg3n2dfg0deo74/98527648932.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765722d1821---23282526478.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdacb34b0a2---84864053361.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b0f89ca4a2b13bb32fb097211401a07/27086427251.pdfIn PDF document text

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