Malicious PDF — malware analysis report

Static analysis result for SHA-256 403cafd5dccc3d8f…

MALICIOUS

PDF

53.9 KB Created: 2021-07-15 11:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4c6060bce9a25add5378e9190456369e SHA-1: 5c6a1b1bd88ee5fed090a3a1508ac52434fe3bbe SHA-256: 403cafd5dccc3d8ff756a9f73745dea8b8a6598c012f8f3a6835c752c3b83833
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6523

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://yptea.com/data/fckeditor/files/28261379379.pdf In PDF document text
    • https://afayl.com/userfiles/file/40277797692.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984aa6063a9---35772811412.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/zivuzedowufibemo.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/27913211356.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d8475d5ae16c00a63df3474177d36a82/loxivemakimaxekatetu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607192833681a---16162590058.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8d01c9f2---zemiritunonutalugibuwez.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/portdbhkn02b7dr6c02lgeo60p/50933444475.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089f4860a386---relisewixanikigeje.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/dijuperiwikabe.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/jujumaxo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/13c84f9ba3bfc16154850c8731815b2f/50574156058.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/lajilinobejaxud.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1b47da46---vapegatutefevogabe.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nk0j7filtjfcludndh53s9jm9g/34000570512.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pofovomifutetal.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nolakude.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/vefubiraraw.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/aodgic83fik2ocn10ot8evda2t/92842904791.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7aec88106---80157374140.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2ee292ou1087lknqgjgpar1ifd/genogenepewofixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=drawing+of+a+cute+dogPDF link annotation

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