Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6191e8db430978…

MALICIOUS

PDF

88.8 KB Created: 2021-07-25 17:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7570ffc3ebce19ba2c25fcbc25ffeff0 SHA-1: 76f4fff0e888dde6d271c58a47b358a06c682998 SHA-256: ed6191e8db430978a3b7dedc31209350f83c8717cda2e6d17cb8fbd676881a09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to external sites, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://planetamama.ru/files/file/sisidinara.pdf In PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202162855322441.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/93287578090.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/93235579099.pdfIn PDF document text
    • https://x-software.cz/data/file/jazibalasofofolom.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/donujoxopigeke.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ikqc5akn8j8posnj7asdph6906/69213191733.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/sopajofetisuxeged.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/suzonufasovegabowubilosap.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/7158305979.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/97703622151.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d21e38aae---lujigutufefujowa.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/rakexolorexekisozop.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b0302c032d5dd5ec411fdb3011344f66/32713756286.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/jewogemiserunumaxa.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/gabozuvixulubuda.pdfIn PDF document text
    • http://lobi.md/userfiles/file/gevezuvagiluwuxazavan.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160825d059f4cb---pawijisifokiwizumubemaj.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/bufexuset.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/65a9b1a0cf4e8084aeb032d9c020c071/28503090795.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/nixatome.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3qqfm752d232j09b2oln0vd4bc/3314104929.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c062f443c7540427f38848f21d9db4ef/jupepimibagoxifebuzibim.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9924c79f1---lajavibawawemedebajejaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+verify+vehicle+registration+in+punjabPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000107ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x107AD 17440 bytes
SHA-256: 8a41d10e197551bb8329fa0c37cd98bd04ed0afe769cc21bb24a208d46511078
font_00_sfnt_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 16900 bytes
SHA-256: 5df9bbfbcd178f9872df6e7b9ebc75a2039666ac337ca3fbe161dd0848769482
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1C 11384 bytes
SHA-256: 2b2a9f321e540e0b39cace9eaa93b179de79e954fa8be42231ea062802bbf4ea

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