Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b4d9f206430215…

MALICIOUS

PDF

47.7 KB Created: 2021-06-13 14:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 521d10c92bcedf2cdb25ab878805c208 SHA-1: f1e7b600a87d0836501e723088007de9f4648b43 SHA-256: b6b4d9f206430215137cdd861be22c12fae4ba2e7015df728cd9a85e653eac17
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The primary goal appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7569

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://krisoc.ru/uplcv?utm_term=understanding+organizational+behaviour PDF link annotation
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/8202367034.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d63ee4614d---savajokisuvibaxewifol.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/damitek.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/nedukoxo.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/f042290tgnq5ekr461mt04748r/runozaxurubal.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b231bc2fa---nobuz.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/sawarexituli.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ac975a72---69689284153.pdfIn PDF document text
    • http://93564497.com/userfiles/35442072734.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d6cd1182---wekoxifugurudexeko.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4f2efcf12153a78acd5c8a4ecaf3400f/weraviguzavulovupumimo.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/0cc0c7bf41a57ac8f4218e202aaccf6d/63270313623.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf467bd4ec---71286402105.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dai4hckf8lbpubio2tl7rqbe3/26851091284.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/1jv1b3clu64blt0k864jgahfv5/27169920403.pdfIn PDF document text

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