Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28ee1c8f05ced4f…

MALICIOUS

PDF

58.3 KB Created: 2021-05-07 07:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea24cefd4532e035bc0ddf3873abbcfb SHA-1: 4fcb2b25466ccbaed7c77358d06301f4581db5a3 SHA-256: d28ee1c8f05ced4f0121f6848a3a7f7f88cfdf1418edcdf93562545388548650
154 Risk Score

Malware Insights

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

This PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation and potentially lure text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

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://garglob.ru/uplcv?utm_term=triple+venn+diagram+template+google+docs
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609120e63791d---samulukujis.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d8d40a9cd0263e392f41d894602e9550/87231180771.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed0cf12c4---veropura.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721cc660bf3---38660255422.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dgntcv26q3lshjcjqccbughg2a/peweratilizuvev.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088772688025---wokov.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607dadea1b5c5---meram.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/89f9f19063540fd14e487098a0881d85/21975366127.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e013c46eb---57686184150.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9ba31a7bc92e3ec7ebffae755000ff7d/97497436926.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16082523889b62---jizusuxisilibikokubami.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91455caf3---84995806341.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b48cd2b3---61119111555.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722eb13e3d9---labujisenokinad.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416c9216fa---febuzotolanuwokiz.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/beabe7e3c69d7f6510c524e7ba57b537/dagal.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_off0000cc54.bin
51eada8d908b8ca1542c3e3aa2d0536ca7e5b12304a95420a26af12974f4da5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 5404 bytes

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