Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6075e4efa43d504…

MALICIOUS

PDF

64.0 KB Created: 2021-05-19 08:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5e9019aa3cc424f760f1bbc8dfb51a9 SHA-1: 2f05418d4d9f2cd19d8e33d173fe1e4b3b48fb4a SHA-256: e6075e4efa43d504b8bf20679cff95fa8fe2b162c3c57cbde6cabb9b32455f0a
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

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://coretry.ru/uplcv?utm_term=breviario+romano+lat%25C3%25ADn+espa%25C3%25B1ol+pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9b2a564d---94072268859.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094064eaafd0---94982265544.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/223ed1e0b9ff42ac549798e8bfc6b220/dukibokolakobesuxiti.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ddc7981daa36c28d967efb8397bd65c3/95015755954.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7dd93c84---pezexenap.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994401e3bfc---pixigedaxuzu.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/u057i52euhjb4sb2pqiii8r90v/11441335003.pdf
    • http://aceonlinementors.com/userfiles/file/rosifaxogejite.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb9267eda9---fesukidajowone.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ulnpn5r5auh7ncfd8ftt63p0l1/75819305040.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18203d190---80004559107.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f801a2e108---47349296303.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/jetujuximigodixup.pdf
    • http://cnex.cc/images/blog//file/32112626652.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a8.bin
45889c1f9dd46bd0d3c78b1dc6365b0e67fe37973361bbc02fd1cc725845b619		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 5560 bytes

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