Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b318e3394026149…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 11:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d3f060b393cad7c6b1fda076c28c28d SHA-1: e6e2bc2d22fa942fb635dc3444f0935c0e77fe25 SHA-256: 3b318e339402614990b0008ed1a41f8b25d9c433219a935f23e58a53089cb596
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=stephen+krashen+language+acquisition+pdf', are likely used to lure victims under the guise of providing academic resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6795

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://oniceh.ru/uplcv?utm_term=stephen+krashen+language+acquisition+pdf PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a3caebb5---45950683040.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/99288922574.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126c53c20a66---wulajizowu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ad9315fa2bae03fe3c83857c65481633/92841176901.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf18132e0b1---94219064086.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/bedavemigigap.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/918hrebncjm50090tri6niq3f4/77662789568.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/pewekofemejimob.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/sokufazuzefuxenolez.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9324f75995---wevidowumi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4dc9e31d3f643a5581c6bec843223161/61718986919.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/48762440251.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/talesegilumotemofazivoles.pdfIn PDF document text
    • https://pindimana.in/uploads/file/zinopujanad.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/43516057940.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/57f27d5d1d6119fcb5f9e664c0006e8f/mitimojetimidulixa.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/90528529768.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/lozezoroxagefuxuj.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/19776518762.pdfIn PDF document text

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