Malicious PDF — malware analysis report

Static analysis result for SHA-256 40920f6a51d245e4…

MALICIOUS

PDF

68.1 KB Created: 2021-05-27 15:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07cb780bcc2b37f8fbeb1ffa05c03241 SHA-1: 8b910d3177abaebc350eb7d5225ba2c1fcb003c1 SHA-256: 40920f6a51d245e4c6c33eb9fc6ee0697246fadb8c21131ef311eac7c9b118aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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 http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f41514e4---70764076565.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/74f5c668b4a4a627e899cef1594de0a0/72023169608.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed0fad042d---nakinisewanokazasisa.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8d395458---fepoxufuf.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866332cf791---98206195814.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea59d394e---41607758799.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4cc6b487b---29099122417.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/cf7f6b23ef15e67d5b1881f0a3b86860/26269403600.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/dgc7kcv53qknmlo0iocsdo2u16/32925322610.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb407c5283---97246128929.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f5ad7aff---24640243381.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f775986c5---34230918806.pdf
    • https://noddy.nu/images/file/59685898699.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+calculate+pile+load+capacity
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f366.bin
005811a5f1ec03e7ea6f151456019f7a5634a4a4ca0ed955dd9a5d8ff2dbbdeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 4948 bytes

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