Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e3f88b354dede1…

MALICIOUS

PDF

58.9 KB Created: 2021-09-17 16:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce09ab7cd2ff9090f26fe12a4494c010 SHA-1: f09089a047125e72e31ce71bbabbe46f366f3d7f SHA-256: d1e3f88b354dede1bdb325983b9ca6df68c3b478d8f1f183340d15aecd6c3b14
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious files. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8763

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=pokemon+ultra+sun+citra+download+android PDF link annotation
    • http://bdpq.hungminhits.com/files/uploaded/files/mimovubisukozo.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/83195105944.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/1150294020.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/85458604426.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902162731.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/suvelikulisefapivu.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/26010294278.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109091800163085.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/jiwunivobarujim.pdfIn PDF document text
    • https://efnnma.org/files/file/16424187965.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/88950828389.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/tixidasulezo.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/fuzixasusimoguburupab.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399719adff7---27485424993.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac48b32cb3---batevalawonatere.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/68850801169.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/42111060520.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161342b55dfeb5---24306939275.pdfIn PDF document text
    • https://rosycaffe.com/file/48509674085.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/91756031798.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/3957778504.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210906042744.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/gijuxu.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/34514747367.pdfIn PDF document text

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