Malicious PDF — malware analysis report

Static analysis result for SHA-256 be10989d857155df…

MALICIOUS

PDF

44.3 KB Created: 2021-09-01 04:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 251c8bba68b479e75e843b24b4c643cf SHA-1: d09b050b15ccc16ce587b71b3c31153521aad510 SHA-256: be10989d857155dfbbe6844ecf4c684ada16f62f227a9ddbfcbcdd4488cec4ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5192

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/766e71c91225a5d5a6338032acf156d4/66038705187.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9eb4edaa4---taruletokirelasuruka.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/vilexepifofevo.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/noguxarafuzede.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a281634b4db---sorarojuni.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/10552408391.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51f7db4d4---55212019063.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/juwonifivonowutakijadal.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/zanoni.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210815184856_MjY1MjM5MDY2MQ==.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/dumowil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=for+honor+warlord+helmetsPDF link annotation

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