Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8b93f74ff99413…

MALICIOUS

PDF

53.7 KB Created: 2021-06-13 05:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e92378d7277893041c008311b23f010 SHA-1: 483a0fabc57468d27c4e57aeb79b030f5f108d04 SHA-256: 9d8b93f74ff9941358c9d7c77f6a07aa6c7eb146fbb1ab29e9ad06a5a49f69ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6856

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://drafthe.ru/uplcv?utm_term=compress+pdf+less+than+500kb+online PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81f70fe38---zitukotejafovor.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/2998537104.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3ec09403067b6ea67a852007ce32d866/davurufefiwapupo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/014cbfbeaeb9e83d0ee758461e326aa0/49105756550.pdfIn PDF document text
    • https://brs.jo/userfiles/files/15323095801.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/fb1bd7f695a2e9055833d8ec2376e5ac/84019119902.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/91299225413.pdfIn PDF document text
    • http://geose.ru/userfiles/file/38056128155.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/78910358943.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/be9ra3i1eu1n4p52jaill5rg63/18694264432.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4cbe01539---12052301.pdfIn PDF document text
    • http://minerva-collection.net/files/files/41908906871.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b27138e292852b59b86f2cf17303932d/jovipunuwepijubexezex.pdfIn PDF document text

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