Malicious PDF — malware analysis report

Static analysis result for SHA-256 9259a9704a9ed7b4…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 14:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdb71e236d47ad42ff71b80eaf7d007b SHA-1: e922c940f50d965516e8654feea53452814d6b0b SHA-256: 9259a9704a9ed7b4878a9821481686cb37bf1e53851a80a35768e2538c26255b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites hosting further PDF files. This suggests the document is part of a link farm designed to distribute malicious content, likely through a spearphishing attachment. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3915da5edc---nuxopi.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/62086115927.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160854d3c48a47---15427675559.pdf
    • http://lavalnerina.it/userfiles/file/xuluremudomaxunarefigav.pdf
    • https://marcuspietrek.de/MARCUS/files/file/90685074892.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/feaa7d137c7e9240acfc9f293d81b975/26124029216.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/34d7413f0b63a2dc54bde5052d35a317/xexonarimovekofozi.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/8qjvsl2jl948vr3agtn47i7d4k/23340428819.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0efefa1657---6280756578.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8bda429ca---62331729748.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c292356721e---63392211728.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf12003d62---jawoduv.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de533c0cb8---49404267.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a2658224b---tegenulel.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/6otcn41oo1nj8ncmllips4uqtn/81230890489.pdf
    • http://contactconfiance.com/files/files/5278303419.pdf
    • https://beaszemin.com/files/natuxixomurezozuxeno.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=power+rangers+dino+charge+episode+1+watch+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef01.bin
4d628a0e4fbeb2b28ecf1c4ac5311546ccf6d2b9785960e6a000dae6d03e7efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 19276 bytes
font_01_sfnt_off00011feb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 16792 bytes
font_02_sfnt_off00013802.bin
a7ebe9d4b0fdccf8349d7fcde0c0c7ff4669bd5a15d18f15413ab7ac0ea4ebf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13802 11040 bytes

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