Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c517272890245d…

MALICIOUS

PDF

65.2 KB Created: 2021-05-14 09:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 206a87e5c48a51e01e52e52428eea63e SHA-1: 2563db9d57c09aa5862e536747ae9efa5f0cda9a SHA-256: c3c517272890245d4ef915efa3e2a736203b03b19db57bb100b1e9ee99142f64
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body, though truncated and obfuscated, appears to be related to job interview questions, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8363

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://susta.vn/userfiles/file/63448234386.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7935352fa---95178644134.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfe8ec9b7---povekezelagutusokex.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160794ee4bc6ec---zedaxigelaze.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/06bb7a80aa415e7f4019f4d26b8e7c42/xopipelazogaxefar.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902dc9b92de---muwaduzawizujinetule.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2aabf0fc---padavevav.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160735d66e51ea---58639542188.pdf
    • http://poorclarescork.ie/images/78602684871.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7fa16636c522815024038535ad33d325/negatagitodifo.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55c049e4d16b079fabaa9a36f50e040c/sopopox.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/nddv4lc374h2qqi0aqrn0bph4n/repiduluwawodi.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160843ee8a61f3---31127701847.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f925b1e1f---vokuderudafepakelasixip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=payroll+administrator+job+interview+questions+and+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f528.bin
28870c6422e2cc024751d7db7b2037bf1288085493346db3c828211d6782c6a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 5568 bytes

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