Malicious PDF — malware analysis report

Static analysis result for SHA-256 555e40fbcf59d5a9…

MALICIOUS

PDF

47.0 KB Created: 2021-09-06 00:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ef33815b20f0d6886dd454481285baa SHA-1: dc8ce19cb5e9a46ad9042d75fd783c789952a270 SHA-256: 555e40fbcf59d5a9f5e65d1b03dbdd0dc83394828bff6ff2ba42e97431be4738
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 host malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware delivery via these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6729

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://oniceh.ru/uplcv?utm_term=parting+glass+sheet+music+pdf PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c662cf914---xepinanodef.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087eb588c79e---25551085944.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/44800905578.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccfc14ab87---46847248631.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/vojerexur.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/75879595456.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/50221475561.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/zagagoweru.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/lobarabunisid.pdfIn PDF document text

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