Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc76a320ff6be04…

MALICIOUS

PDF

79.9 KB Created: 2021-08-29 11:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92541b4e4201bee7557f3e395590eea7 SHA-1: 0c918b6e30a544a2e091f7e21c87ff8a371ce1a7 SHA-256: 2bc76a320ff6be04963735be935a7eb0a73c5e9cc08a762dcf6670119c5baef7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. The document contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting a phishing or redirection attempt to deliver a secondary payload. No scripts were extracted, but the presence of numerous external links and the overall structure strongly suggest a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e373ea97b---gijona.pdf In PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/votutawoneveronigunateg.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/11074167356.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c22791409fb---31650971219.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a26529d07---sonaxuwidetagegafezaderuw.pdfIn PDF document text
    • http://vipdiler.ru/files/file/povakuzuzobirinodufex.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5f4043e355d00e4889e33519ce6a3cb1/janegofolirer.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tilakewujoloxipulikaxa.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4eb82ade7fa7e65fb6be7e84f9c60cb6/58876971032.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fc642e07cc133dea37b5e0d92ea4995d/75894104864.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xalefamezojanagusilime.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6c0133595782d94585f31b9cf995524/60037077493.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/katofebiwovovugezixanabil.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cd97b565---vukosebiz.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/wunidumoloxobebukevatax.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6ecc65da---88362839535.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/73508b43c166915d67d3c76084b68e32/91500613761.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/9u6e9g2nh29mr951npm9nev05b/nagokuvojugekaxumep.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9kv136vdr8jkdkuvg000cgunum/26665795997.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/3945611902.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e3d91404---83833073143.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ee5c5945---90454615212.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ea2210b55---jagoropazevule.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/vebigez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=supercilious+used+in+a+sentencePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 17452 bytes
SHA-256: 4fcf25d9d14ab710988b1fe2756164958ec727e7b53caf1dceccee6036c212ec
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 10684 bytes
SHA-256: 1674eb7263a6fa2045fe7f8d6a17d5679f332c9132c3b420544b5f2770befba2
font_02_sfnt_off00011978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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