Malicious PDF — malware analysis report

Static analysis result for SHA-256 2825c64e42f20f4b…

MALICIOUS

PDF

152.1 KB Created: 2021-06-30 23:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d86adf42d54584d8cc6e1802a85527a6 SHA-1: f30fd2453c33438fd6787f1641b6fecb9eed92b3 SHA-256: 2825c64e42f20f4bae1a2958d77d111d23770fa523c95006b3989f20e8f3a925
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://tribo.kz/userfiles/File/todotadakitikoforuwumako.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6afnfnkdihv8ptl7dh7m3cpivk/wazanegiparixavurovezew.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/833a694a3c334052349a890329626293/zagetamimedotufagukanapi.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e524278073---834732958.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/eb037123c9715d6f2cf503f944db3518/13589457444.pdf
    • http://accessiblevehicleservices.com/userfiles/file/zagafukalu.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/fenadiwapopesilunoluzita.pdf
    • http://dlevitin.ru/fck_editor_files/files/60370177601.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ecbn910bg706o2iddl89tv20o9/diremetanoduwonekaga.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608afb3409651---71359406022.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/r7lh759d9q6qb86rgrn50jpini/116132979.pdf
    • http://curry-box-deluxe.de/userfiles/file/gilifen.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c81697da---bemimisivumoliwiw.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/05f81ab6140efc53173ece02c7478265/48134096821.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cca73cd62---wejilolezegud.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ecoico1i8bv5o45pls8njjhil5/19215965448.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/h36b9qeudra2lviq0m6p8fi8t3/lomotava.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce11ac78850---gugunosikopafutegomob.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a093a71d7c8---xuguwuzod.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0558f3b7---gilapenulevepeguzudejez.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607963c5cb3f6---84149189030.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8145a5643---54426725797.pdf
    • http://glotecgh.com/upload/editor/file/nebubusoba.pdf
    • https://zlatartopalovic.rs//files/35918128428.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=magnus+chase+first+book
    • 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_off0001f39e.bin
f0b5c78b29c9dd89e0874b373758e0492ef06f61d15ddc4a96b28389e3c5107c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F39E 17892 bytes
font_01_sfnt_off0002218f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2218F 16792 bytes
font_02_sfnt_off000239a6.bin
f06e4b066ed0e090856414dd8f9425439449c9c4c9928c843d577431d7424f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x239A6 10896 bytes

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