Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ebf6c3b63e6fe8…

MALICIOUS

PDF

102.4 KB Created: 2021-06-15 15:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28824650866b735b902f0e20d51e52f5 SHA-1: 344e7bdbbe44ec1fa67602ad4552e616af3432ae SHA-256: 44ebf6c3b63e6fe8914ced103bb63708a09be6f25c2cfc1201b53ca0bcebf3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The document body text is obfuscated and does not provide clear instructions, but the embedded URLs and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://huntic.ru/uplcv?utm_term=3+circles+venn+diagram
    • http://accessiblevehicleservices.com/userfiles/file/3299224428.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d39576245---kamadatezogapibewinew.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3ks2bjiso02fkgvgd1d0dqkuu3/moxukulizupuvebareb.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/75287616663.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6c376f184691b77d83a6d58bdb9ebc96/48191044093.pdf
    • https://eminencesolutions.in/resources/userfiles/file/43271974014.pdf
    • https://decoveinvestment.com/userfiles/file/4377522413.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/deef0883a44f4db5b075fc4afefdb00f/zitemiledafamugima.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160965e6131fda---22612527148.pdf
    • http://videofilm-tv.ru/content/File/69923896225.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/36c850cfe50a9ddb7f4e9155537678b3/jivipekilutuxazepefagol.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e044013566---78858147600.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076045028838---dajefe.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe98cb5602---zedasurodesixiwosawa.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3inj0hde2v8o0epcqcqtoutqk3/nebelorafugowijamojilu.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1jclbru3oacsvbcgfcj7bb0v57/64584727268.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b2e.bin
508c4b3290e0b04248ffb5e0a61d3db566e6b4c176a100101bfddfd939e5c8a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2E 5388 bytes
font_01_sfnt_off00013d65.bin
7dfb41fc2a203dc6156c79096b16a6e8de90e1049025b9a7bbde63dd7e8b2d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D65 4060 bytes
font_02_sfnt_off00014cfb.bin
156c19cc1a70af831dc5fcb6bf0b28616032ef454de44f7a587c795253043670
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFB 12188 bytes
font_03_sfnt_off000175c8.bin
e1e6aa468bd8063169bcb24fc0af8e5fd377487a9c423a68eb55727490d10bbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x175C8 16320 bytes