Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b7fe57abd7cbf8…

MALICIOUS

PDF

53.3 KB Created: 2021-09-01 01:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 556988cd26ea1b318321b44785cdde8c SHA-1: ea191cd43c983a07e0b8bc131a09586f686a25e3 SHA-256: 58b7fe57abd7cbf8017521768d230408ac15cd36eedff152f520695b7ea8f432
94 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. It contains multiple links, one of which points to a compromised WordPress upload directory, suggesting a lure to download further malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2644

Heuristics 4

  • 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.
  • 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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5abb3b9dc---85854102275.pdf In PDF document text
    • http://technestudio.eu/userfiles/files/29209022862.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/rulekumafak.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/hpphp7942m1umb78kqpbc3mo31/bimilizunerabijezilevoj.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822acd82feb---80667450099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dehydration+and+coldPDF link annotation

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