Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7d528a1252e14a…

MALICIOUS

PDF

81.3 KB Created: 2021-07-03 23:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7285ee57b110db26682047d901f6d0b3 SHA-1: 4e9cb779b0ad9f405beb2d5f975951432ee4f240 SHA-256: fa7d528a1252e14ac44ad9adc0b4697b2e88cca7682e02b535f3371ea1864d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a pattern of using compromised web infrastructure to host or link to malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://garglob.ru/uplcv?utm_term=unicorn+easy+coloring+pages
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/vumerulemiloloxu.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/95c48d2feca7abb1cd1a2ca597dca250/57677670435.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090488228a66---tatufunuki.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/gfhn0992qoe62j617hr9ibhlg4/neriwexebefogixak.pdf
    • http://criollo-cocoa.com/userfiles/file/69600475765.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160888ab827b4e---kikixifelipimemutoxowijej.pdf
    • http://www.romanschatztruhe.de/img/files/nabamejitilanu.pdf
    • https://sportcity.bg/webroot/img/content/files/26161096973.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5gj437n6jq6shat6nsl1a82sm2/duwatexe.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d312b850---58374370322.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/ce23175e480c68d8eb2235fa11cfc523/25505389588.pdf
    • https://denizlihorozu.com/resimler/files/fodepibukazinanonakoduwal.pdf
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/tejewujifemawidexunemelov.pdf
    • https://rajatotogroup2.com/contents//files/vukofivipapafefat.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/ditofozimuvaxijoja.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abac4315887---misidavibob.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8ce24fc4---71966719803.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d529fc0e2b---kukorifidawokuwuxigigoj.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c85c2b7c7e24b005ceda95ef03047005/vogixebazofodeju.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8580cec5---sopenexoroxakabaperajumum.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6f0cbbd4a67fd46cbe5f6026f4596292/99991267338.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/l2jjhfcn9bpjsoki6r0mmtqora/bidoza.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d35316b6---letigosegolip.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a066c441cc6---poxogijipolusa.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8897b15079122b910b0f8bfd77a874a5/kutemadazasezudewuwibazim.pdf
    • 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_off0000dc50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 16792 bytes
font_01_sfnt_off0000f467.bin
c73eb6caa9a5f1367f888a47027eb2c4b31e8ce1d3add1554ca8dc92c7300ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 10572 bytes
font_02_sfnt_off00010ca3.bin
e701c647bde0207e85d55bd0f58df2e4dfb36422e9d9d045a041494e804819db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 16580 bytes

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