Malicious PDF — malware analysis report

Static analysis result for SHA-256 c255642a6669801d…

MALICIOUS

PDF

97.0 KB Created: 2021-07-01 13:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5722aa4bbe4f68fddeb3f3f8134c5efc SHA-1: 8908cfe48df5ccef4b0febabff3e077868993f2b SHA-256: c255642a6669801dfddb2cb07c9d6a9d834c77b4bbbcbeaafc7d7119f01223da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5293

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://infrive.ru/uplcv?utm_term=how+long+does+it+take+for+ultram+to+work PDF link annotation
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/46642506410.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/513c3585865cc9a535f909c13c8d7d9d/bakodowisujevijuvixis.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/341d6a5aa64c3fa9b51381ec5af107c5/wadosu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3892c11b9---53871113549.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088039cf2f7f---tifegupinopokekilexekikaj.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/65085874981.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/25986561c501500e4938046eb416c0ec/63686773452.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160932f8780589---xowikagulemedepifed.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082aabec087f---xamuzevenifakufarowafo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dkcbbnpf9avatj5regibp5h4no/93959423977.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d228d987d8---43792161435.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/moravotowiw.pdfIn PDF document text
    • https://lesura.net/userfiles/file/rovokapunesipo.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/xexusokowazokemipor.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/38193996136.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075af80ca76e---55979955479.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/27772668001.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e63a88888758440e4a26fdba06f07e6f/dadejenizebitunemipererom.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fba49f64ee8a0c48c1a47def7d9cf2d1/biwiremigijodem.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a92667b21da---rusugifukunina.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/7565368362.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d4b3ce47a2c0971bb9e975c5ccd28069/sepede.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-25/20210625135001380420.pdfIn PDF document text

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