Malicious PDF — malware analysis report

Static analysis result for SHA-256 58092fdf61676579…

MALICIOUS

PDF

39.6 KB Created: 2021-06-14 10:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3821a1da7b72f6da1960169986d4b327 SHA-1: 1acd498df7418689291d78f63896186808d77ab0 SHA-256: 58092fdf616765796008cf87700573d81be731371b27535462e3628f0580d5bb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9063

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=andrew+loomis+pdf+free+download PDF link annotation
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7d425acb5ba4c231619153edbb7b4732/22161824599.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae8c71a9e---tujot.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9bd0e6c42fa039571c03164191f5e7ea/firasat.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073201863bca---12690970133.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/12173585357.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68f57b9f23---53502560938.pdfIn PDF document text
    • http://coffee33.ru/archive/file/fimimavawulujulo.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/98684397763.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f86175cf822d6248fe9fa269e2ea3d52/mekebivamo.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/jebuzikinazoxoxa.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/2811532441.pdfIn PDF document text
    • http://abnicum.com/files/file/2921135883.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/semadevazev.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b13c60d3a45---61453807278.pdfIn PDF document text

Related samples 8

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