Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b23bda21cc7d09…

MALICIOUS

PDF

59.6 KB Created: 2021-09-01 08:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 323715ea807ddb5937d29532e01d9783 SHA-1: dec76e73b6a6d7fe385d287ed68ea93e210fa32c SHA-256: 99b23bda21cc7d0956ba72939ec0c5bb6c28ac98791e8a37d2d6c48c65bcc359
154 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of multiple external links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9354

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://materialdeestudo.top/userfiles/files/tisiponosul.pdf In PDF document text
    • http://polymer-optix.de/userfiles/file/xebaloninonozenetazimew.pdfIn PDF document text
    • http://bamor.org/userfiles/file/69531078327.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/86350762070.pdfIn PDF document text
    • http://spiregene.com/image/files/20210731_130051.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59bfe70f2---46655843516.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210826_5E7320B8C1D41334.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dd6a41d3b---xizega.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27da6a9fb6---86407646188.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160879354e9196---gedop.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/43897116583.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/57289362924.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/021c34370077c698c989feb631f175cc/93346000517.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/aa7d02fa518bdb6052bb70f03334d986/lejenebavu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee26a820427---14109171061.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c7113a54f3e65542c3e6764d811178e5/fafovubizexanijidogozu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/safipijoxosakunuwabotu.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/nojezogiwafog.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd341d6f27---67586887001.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3666b17b---15208270414.pdfIn PDF document text
    • http://master-br.ru/img/file/xanurovita.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee41bd7cd53---71653381338.pdfIn PDF document text
    • http://autovoda.ru/upload/files/jebumiwosabuzogate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=all+major+guitar+scalesPDF link annotation

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