Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80c7502110bd1d9…

MALICIOUS

PDF

52.5 KB Created: 2021-09-04 22:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7fd5ce9d95e3a8dc10906cec5b086fbc SHA-1: 621cd579e0bd063751fac59a36c8a8f3ffcca291 SHA-256: c80c7502110bd1d9b0d45ef78b08414874ce33e02a6b33f4ce818507f60f12c0
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a lure for phishing or malware downloads. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7990

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://inwebjor.ru/uplcv?utm_term=nss+enrollment+form+pdf PDF link annotation
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/64230e77295724979a87eac89f18c7a0/55182755913.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/79695951282.pdfIn PDF document text
    • http://lawngo.net/fckfiles/4033240694.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba1f08abee---retogixovezukokiduw.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c87bc65421f---47731782330.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/igpb5ri1bh4vnhsnjv9b4bvkp4/xaroli.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c139f126df6a1e522825bc80a5bee59/rowujefazizizozanuxekipuf.pdfIn PDF document text
    • http://jucal.es/images/file/87898124773.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085491d1c368---38618399832.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/48498309976.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/lapinonovukube.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/lozakebilivugopinuwevepiz.pdfIn PDF document text
    • http://12shio5.com/contents//files/71864288858.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/rixanolasu.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/a2b342260a6f08d920cd308cf1b08136/valegupujilugive.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/lezebogabivopotisobelen.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161108a7ccc4a5---tomanisejotal.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ac8370e5---depuzoriragadorik.pdfIn PDF document text

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