Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e140dec94a5b4cc…

MALICIOUS

PDF

49.2 KB Created: 2021-06-07 21:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d683f645ca426d62272bae89d43fe4f1 SHA-1: f6b46af5a624d8e36c95286894f4946e333ee9ac SHA-256: 4e140dec94a5b4cce6f9fc1c4201ebf6229fd96b4cb32bcc3aabadaf74ee0e52
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

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://catamma.ru/uplcv?utm_term=correction+livre+physique+terminale+s+collection+sirius PDF link annotation
    • http://alexanderjamesbackcatalogue.com/userfiles/file/xobegafi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/6597196701.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/1943275318.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b8ef6ffd0d6d3879b52965985687d17c/16881879789.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1d842102---finib.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zepowamu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8370c7e2e8e40a6f033cfb646a9a38d6/vikimuwagurosobel.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7792bc4af75fa3898e022317b2d85155/75771568024.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9325357e50cf27102cbc03b6ee180c90/22166882779.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c9401e00---56370352081.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836af9477f4---jezafeleki.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/01dc88c9300d31e4da18d6583bc306ce/tifetowo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfab574e80---98102918495.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeef5eda9---28219358131.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/xawawolixevekog.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c2c06ede---99803427427.pdfIn PDF document text

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