Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c217d97ccbfb1bc…

MALICIOUS

PDF

80.3 KB Created: 2021-05-14 01:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8905ea49330c6b57d91c43be6fb95ae7 SHA-1: 69d6446d07d0aed3075b470be4979539f21f0b99 SHA-256: 1c217d97ccbfb1bc1c98e5b6cc8b3661dcf6cf189b1d5ac2fa88edaee28f5194
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for SEO poisoning or phishing. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9503

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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc5045cf4d5fb1ffeea23e9be4f21fd0/98815694568.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u6flqhftfntva1oa5hlarhor21/zigiwupibure.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7802uf4btjhh7rggvpjpt3vh2d/14920475184.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7f1bbfc973bfe5fb44e6aa2e6841ca4c/kupusuwepuwoda.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/99d179e56ee3c3a9bb434525c77ac08c/segowodu.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07791cea0---lipazoparagesebaz.pdf
    • https://baobihungphu.com/media/ftp/file/pagadozo.pdf
    • https://ebooksweb.net/files/file/14970211918.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8d86277804e8e8182975ccd3f5cd8592/48487749261.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b727c54f---59572934960.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5cadec953---velifomiduraxudijekime.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608084bb98847---kumutizi.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/98717d6726ddb49110d475a4d9d72df2/8718859330.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d72baad331f4892eed91548f2669171a/zomosalosajatugedibaperoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=acronyms+in+computer+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011516.bin
04983f8b7c1d187ff55582ec51092b3df132f595f0be0f4231ff7d9258bc27bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 5152 bytes

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