Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea85ffa111749e62…

MALICIOUS

PDF

48.0 KB Created: 2021-09-02 16:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38d1380fcb3051e9633987e37b1a3c44 SHA-1: b96101d72ccd3e0232a472867602f4db392e7403 SHA-256: ea85ffa111749e62efe240a572a384409ecede3ee023a5de136c1acd4a422402
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised or disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7960

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 http://hanlacsclub.com/ckupload/files/fesujetobolizakef.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d441d67d4---xigipaliwipa.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fetirewaleforovarowezizi.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/lizerijexizelap.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/xenen.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce61cefc0f---nunujawukutobo.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/db0uen61js103pgdisr92m7tuo/92167971675.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/wamaweni.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qd66blhb04viilg5n0flh0or8l/fukawikegovujumejasenen.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zakenexadaxuxa.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/votogurawovixeduvekux.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/tumajadevajaf.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-11/20210811155853945886.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210629_210030.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/4085In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+loneliness+of+the+long+distance+runner+analysis+pdfPDF link annotation

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