Malicious PDF — malware analysis report

Static analysis result for SHA-256 874f0776a422e409…

MALICIOUS

PDF

68.1 KB Created: 2021-05-16 13:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b7353db750a86d27dca5f59e0f03cf5 SHA-1: ab0c18353ee0060997ddb52cfb59836d7f57ca1f SHA-256: 874f0776a422e409a120e32fec6b98f04b7674622084109623f9877bbb2bff20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7539

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 https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gqgsucoordej09brlnc4n78a6d/wogiw.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8cf31c822---53151135214.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ddc512c1d26488bbbf754fbe935e1a2c/seropedotipazejuzudijes.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/30b33832df593dc0cd1579feef65f523/5374542622.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8ee82356---womiwaxudadizagexaj.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/be8782a4933dd95a5314b8f4261eb140/gujapu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160739fcf2472f---52541070062.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a6316f8387bdf9ff52e6654ceaf7a213/xugeferonof.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0d8f382860b6dc378c155dba6194ef23/gemovijimog.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074af88b0a50---19019495702.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/131119de8e0285fd94398651ee92c13e/vusudepavalajuma.pdf
    • https://alakharia.com/public_html/userfiles/file/wokurosifefitopa.pdf
    • https://armagedonspedycja.pl/files/file/kigetumesubodujosajuvel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ant+er+for+firefox+56
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e049.bin
afb23b8a8bcf5fdb50bdea29843f9bc6b1b7e71b0bc4f5c0ebaeab3ea4af9086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 4676 bytes
font_01_sfnt_off0000f047.bin
84daf345e21b08075a6e329eeacb0a13a0447ddcc3efc64e98a9a4ab9c6a9d9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 1936 bytes

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