Malicious PDF — malware analysis report

Static analysis result for SHA-256 633f213e0cb8bc89…

MALICIOUS

PDF

59.6 KB Created: 2021-08-11 01:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 920277913e57194b7c9aca24b415a6be SHA-1: 04f70a8410ee2ec6a99ac56e0f43b7dd15c25e79 SHA-256: 633f213e0cb8bc89b836ae3d5aacc0eee16fa9cd2d7836f1a6fe721f8e4a5b7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains a link farm pointing to multiple compromised websites, likely to host malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF's structure and embedded links suggest it is designed to trick users into downloading further malicious content, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7094

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://szabobuszberles.hu/files/files/gevogizurerufagigopi.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nuvuboboseribat.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/72889639880.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39ea05cf23---bokowasonunasilozu.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xizosewijujejafidelom.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/73515430037.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/33796520978.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c396bbe46c11a9beefba86ef54478356/robowejelisosobezeke.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8bc17175cf26cb375118e71b60c09e1d/32430556053.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8718dc975---77980245789.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086db305254c---10561766611.pdfIn PDF document text
    • http://lucann.com/Upload/file/luvasevu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1610061536147e---nikuraliv.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/4073446689.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/84150167236.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/73561840553.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/98461678672.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/23605906672.pdfIn PDF document text
    • http://compsult.net/userfiles/file/76034488790.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/88104114792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=brown+bear+brown+bear+what+do+u+see+songPDF link annotation

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