Malicious PDF — malware analysis report

Static analysis result for SHA-256 9921598545d86458…

MALICIOUS

PDF

64.0 KB Created: 2021-06-13 00:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f5f5d104887d57e91e09034519e93cb1 SHA-1: 5df33436c8391546e796022fe4c35f23ef9ef67c SHA-256: 9921598545d86458d25ab477f8448a5ba475e9c0b60992bc15ca447afa05d7e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The presence of a 'link farm' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to redirect users to potentially harmful content. The document body is heavily obfuscated and appears to be non-readable text, further indicating it's not intended for user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7311

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://laborke.ru/uplcv?utm_term=hd+male+tube PDF link annotation
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/o9jq1tpfqohe2e17bm3pdi6ml1/figotoxim.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/razelogezalog.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/r8t2v98793s9kmvg2tp1vdcajd/jabenoxiroko.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c78da0ef8f2759b13a734f3b19ee14c/3667408740.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/15b699fdf486bf8534a51d78072ac7d2/48078895144.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160868b6a1c614---85125950754.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e6ee39326a0ede2e04560bc37e640b6c/68489012602.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/bepekigiwejixadukutu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cc905c22a---legijek.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/tizobababotab.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ff64801f99683d36f60e5261a1b345ec/33338297567.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/h9r6ui0ilgq0kf85qbepd6cah2/zonixulilife.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/tozaki.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/d43mmne51hmvim171e4qiishf5/menageromemobatulodu.pdfIn PDF document text

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