Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f0fbe54ab8c7c8…

MALICIOUS

PDF

58.8 KB Created: 2021-06-17 19:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 744d2b1bd108f45653725e2b9e549572 SHA-1: d26a8bdb6b7ae644d43042dc52c9a4f1c55ae693 SHA-256: 10f0fbe54ab8c7c876207e45be599b7891f6e6612cffd2abc338ced78c499959
154 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7196

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://crewmak.ru/uplcv?utm_term=my+little+pony+rainbow+runners+hack
    • http://www.physedu.in/newsite/userfiles/files/57279067126.pdf
    • http://goref.ru/files/file/23399505409.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a821df5df---jofonoponove.pdf
    • https://travelstore.tn/userfiles/file/xotisa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c76b4201---84179318716.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ccjqm8apc2aundcs6506mbqarg/15590808076.pdf
    • http://www.jindatunnel.com/up_files/file/vunegopilojapu.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a539f3283d8---52204803637.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/affcefe24f1fe10672a96a95017076c4/83450077457.pdf
    • http://fogathajtohirek.hu/fckfiles/file/xexevigobigolu.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/69d950857855287358ab18c699e70e24/94248165115.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/6fugoq0jd3m41bctqf6a29rtn5/53148191.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f9f2d0d705dbf84426d2ef1c8cdad2c5/zuvufogavumavawi.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5678623da---49342934640.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907428546c6---60010557627.pdf
    • https://cjsc.se/ckfinder/userfiles/files/momon.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608073505ad81---figimumuredikezubidepo.pdf

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