Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d4576d571cba42…

MALICIOUS

PDF

55.8 KB Created: 2021-06-17 14:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ca9a7852303315b91fda4c2dbbac3180 SHA-1: 6016863ceda4361bf071dff3962f2b76834ddb39 SHA-256: 13d4576d571cba42f7e30d695d00ef752b4eada31398d0c3ac95cf33a1243f93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8615

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 http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a4f5a2f43cad628b4a8122c8f0da0dba/79459495659.pdf In PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/vibixajipozevibekewu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bc5aeea39050ec9b077c3090de278724/devexezusunolerafefax.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607306d02a0f9---fepibej.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d437768898e8dc782d859cf4533dd20/6339873905.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/it7ju6i3kvu1083s41iu2gcst1/zamagunuwoxisimugokizum.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1014375d22---26587188584.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/80864541448.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f2b867e1a97758d51510ceff3dd22a66/vujuxifapetewozozuvu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/8rlor16qi4mui3novar14n8k9i/65922524643.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5efe20fc73---1056285766.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/08fa0d6586032627e452e55576f70035/20781210490.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a0ad44fd7e1bc195414a8bfa8c9bda71/zetagokofoxatove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+presentation+layoutPDF link annotation

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