Malicious PDF — malware analysis report

Static analysis result for SHA-256 86482bcc30a205cf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 15:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2018ec3b456d9befc4eb42ab10b4db14 SHA-1: 13a590336bd92676b4594f4159f7a59071f5f980 SHA-256: 86482bcc30a205cfaafeee64be41335c9ab05fa1b4037b166ce6662aeb6efe06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern is indicative of a link farm designed to obscure the ultimate destination and potentially evade detection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9af55678d---voparud.pdf
    • http://voijin.com/userfiles/files/vofilitarasupegupuma.pdf
    • http://konditsionery-odincovo.ru/upload_picture/file/67899870237.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cebabe49d82---gufufonurigaduluve.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wolapogolopobajoworemid.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/39191357956.pdf
    • https://music-group-store.com/upload/files/65070589730.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41004f255---fokuzowu.pdf
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/50576729368.pdf
    • http://terezmisszio.eu/files/file/rejofenuguxunulixurukewok.pdf
    • https://fulzugaskozpont.hu/files/74038245117.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/57a93fb5651eaca59c5bb06f9a994e6d/raxonepexu.pdf
    • http://dentherapia.hu/files/file/32122444226.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f05e036807---8639943319.pdf
    • https://exam11.menapoint.com/app/webroot/upload/files/58158257143.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hbdtotptdtoeglu0kph0jfjvg0/49612997943.pdf
    • http://em-mould.com/ckfinder/userfiles/files/sugobu.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/40673258120.pdf
    • https://bahispesinde.com/gnc/veri/_files/98837166473.pdf
    • http://learningkey.org/userfiles/26795956892.pdf
    • https://yasacompany.com/upload/files/95732391874.pdf
    • http://zjhywt.com/images/upload/File/livagasewogitilixegida.pdf
    • http://asremajazi.com/uploads/files/10512557631.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vertebrados+caracteristicas+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_off0000dc9e.bin
259b0f02bb167fa2cd665dd4ccfd59042136c222e420cfc8c0755c58a61fbbb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 18436 bytes
font_01_sfnt_off00010b37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 16792 bytes
font_02_sfnt_off0001234e.bin
040d82c608ba7e372aa59c3b7dd6f8344dc6136330e6ef60f989f65d45201e0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 10572 bytes