Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d3b981444e807f…

MALICIOUS

PDF

58.1 KB Created: 2021-09-06 00:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cc29742cf65d3e88dc5067c8c2f2ec87 SHA-1: 3183bfd7bdf9da28e17087fa24ff65baf01c41b9 SHA-256: 43d3b981444e807fd2581b76ecd45dc60b27f4667d9cc799ca8bbf5159620721
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7562

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 http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b729ed7a24d---kofimirerufazowuvep.pdf In PDF document text
    • http://samtle.net/ckupload/files/putezegusobawawoxu.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/97417453835.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/65042305025.pdfIn PDF document text
    • http://samtekelektrik.com/files/bomapujeratavo.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/31462824021.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/53813611397.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/nafuja.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49af970b4---92703235302.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/48195175920.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/wonajetowitodifaler.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cc3b436b---mezoxemawipo.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/18838784803.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16088e279f3eed---perexanori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rivalry+laurelin+paige+pdfPDF link annotation

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