Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2d54111d271a2d…

MALICIOUS

PDF

87.0 KB Created: 2021-08-01 13:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f49eaaa6a1d2e1e8bef7b61b9c826425 SHA-1: 643ca2b916eadbd70d80345b9a3df5e8470d62fa SHA-256: ff2d54111d271a2d05e805c7ee532b4a6831ff3e44c9f921ff3b907be6c19dfd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL analysis point to a link farm used for distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mecaniquekd.ca/upload/file/devegex.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/u7kmk566vamibqq0i5o5mthj3h/34100094087.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ba0bf3a12ee9b501250c490a9d16743f/tujisipuxex.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/jilidibuxunav.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c4185449---360313968.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/rawewojowukedutikusitaw.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/pesuzewunefaburubun.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/72650186544.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2021367a00---25402898912.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f285d0ba20---68296741497.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/vvtlbhubuvpaeoj2immmt6t27b/kulutat.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/t6ii479jdmo3ed3cgu1mfps79f/pekovowudepodazim.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9b5b0055dd6643aa7ee50813aeef5078/tevugosibofokisomuraxi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dc9c1605e91b86026a891ecd5d180589/80094620632.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d219b738fad---66048876376.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/64161483269.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/251f888ff01ba02c60bf06ae2cf66293/84938834619.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/momedugimab.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6a18de2aa6f3926d9e51c169119083f3/xiluzosidejebibu.pdfIn PDF document text
    • http://belst.by/upload/file/76653171625.pdfIn PDF document text
    • http://soupworld.de/upload/file/tololaxanulinesoz.pdfIn PDF document text
    • http://huimao.com/upload/69392869683.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c460adc2fc8---nivebafatapexenurifabin.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/rexubabalurirogeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+to+listen+for+in+music+coplandPDF 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_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16972 bytes
SHA-256: 5c56b0c766f9342baca812eba8016ae5dd5f887b0cf375d6341d2fbb720f54d6
font_01_sfnt_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 10976 bytes
SHA-256: a31d59c580c1b01d2e9e6d09761002ecb628b6d546f22cf62278f9dcb33d032d
font_02_sfnt_off000135f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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