Malicious PDF — malware analysis report

Static analysis result for SHA-256 f371654fdd452592…

MALICIOUS

PDF

73.5 KB Created: 2021-05-14 01:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ec33797c2a8d214f33bcc00aca4a6f6 SHA-1: e039a21c8d89ce66d4d4369bd45d083c7c511792 SHA-256: f371654fdd45259227ba03d3f43ab5780c70949fc60279c64a32404c060caf5b
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDF files. These linked PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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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