Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39af5c022bb0cdc…

MALICIOUS

PDF

132.3 KB Created: 2021-06-10 18:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7424b66d198a173a4427c45230c72658 SHA-1: 4da4c7ad25eb0fe9be21e1415c5725959493538c SHA-256: b39af5c022bb0cdc863029312ccd2b9ad1f99beef17f7d5568320d8f5d8f6fcd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9319

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://garglob.ru/uplcv?utm_term=gateway+2nd+edition+b1+student%2527s+book+answers PDF link annotation
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e6d3fa6bacc787ac115220dfa6e7b13/limopoleji.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/64883323196.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c61c27bf0b55639e3b1ebd51557967d5/dizubelikij.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b10a2efbe---pagajagubufeguwoluvod.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/33df6bae1b6bde924871558906f2adec/wiworodogufodobalev.pdfIn PDF document text
    • https://kopari.hu/files/file/78121062304.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/9163988960.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/794f060e264599219484232d67d300ba/79286940263.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/13037967621.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4209f318f---tajegowadodimim.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ta2od6l5a1ooh5di8onkrcc2d7/fijelawapevaxed.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/97073987267.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021051614135852.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9aebaa7b---13964093441.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rfsiaitjll6ohtro51ipirl4l4/jasunovinakigotovozo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608162fbda080---91011852506.pdfIn PDF document text

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