Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10d0e2cc14d2938…

MALICIOUS

PDF

59.8 KB Created: 2021-05-24 08:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1374125aceb79328ba2379331584f0d6 SHA-1: 4620763235e76ac23e4ff8067369e28a78643094 SHA-256: b10d0e2cc14d2938321da21967a55713d616debcd944ae5f99290b11d395b189
154 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a search query, indicating a deceptive pretext to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://synerhu.ru/uplcv?utm_term=how+do+i+program+my+xr15+remote+to+my+tv
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ded13af101756065ce7533a843b526f8/36182006770.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmlj606e6debehnlvvttav0rhg/dizewu.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/l4jjtri0rls11jfac5usddmsab/3273003280.pdf
    • http://alliance-ltd.com/userfiles/20010280950.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7139d200---35125039830.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcdd9cdc10---74201590484.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdb395c337---44358362049.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/047a65a6a9dcd6fae09553f50c5147f7/63017889809.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d191940fb4---bokulafusilepezuziw.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/htrgiioa302oasocagqft6lh8h/kukakaruvalebas.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/cafc7f54360032b9b4b445f8df942044/71295059796.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/817860a26a9626d13c00dc6a8f8e7c53/tefawibususuxevoti.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/876210d012b82455b4330a39cde78547/29457509742.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ff34fdda5fba138f6f72e2dc709a7dd9/11263902563.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df24f226c---lalutovuwak.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd01ac44a---76977021903.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1af7eb53e---pekukexefapogidorafomis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91a.bin
88d42f4b208bda2a600682273739884f1b04d47c0f3c0a73b44649dc5440c277		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 5528 bytes

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