Malicious PDF — malware analysis report

Static analysis result for SHA-256 0231fac6f6661f77…

MALICIOUS

PDF

96.0 KB Created: 2021-06-13 08:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4c84b0f33158124be8da02812e217d1f SHA-1: f6817fe0024398c1ff0ca8681a2322a9d72e1a59 SHA-256: 0231fac6f6661f77e06f95013d5085bc01022357d2a9cb3e4a13d755346c7a24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier flagging indicate malicious intent. The document body, though heavily obfuscated, contains references to 'tubidy mp3 download lagu free', reinforcing the lure of free content to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7172

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=tubidy+mp3+download+lagu+free PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2ff2e682bd90d217e5625240ff3b03e4/firaxedarosu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb523ff55---tevekefutofo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc4ac54e2c---24142474744.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d63f7a8c1---20831827943.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607235c89712c---nitufabovovezoduwone.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/a607185afd45ae65b6dac025b248c15d/magenuwumikobolaneze.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/13180280880.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2bb3ef4c707d3de758148f9a99fe21b3/27706700034.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb152e5767---90198706100.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607491a996f5b---33787321642.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d805b762---pumubiwizi.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f18adac3ffc2f6fe1c72dfe5d6b80c16/49393996978.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8686d60f2dbd4ad0a851a53727d6e550/xajexopot.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c69e24cb3d7156b0dc2900a94aec6bf6/tofipowefeti.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c566f0ebad2---59577471395.pdfIn PDF document text

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