Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc0f2ce50083bc4…

MALICIOUS

PDF

69.9 KB Created: 2021-10-04 02:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b00fc409aafc16e223c61c37514dcf5 SHA-1: d4e892501856ea238feeb5424a6884b563c715b3 SHA-256: 0cc0f2ce50083bc4961baefa0ac8b5deb8b6ce14753593fc7e90e07d4ec641f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=innovation+and+creativity+self+appraisal+comments PDF link annotation
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/46868389345.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/1a5h92fhv6h7gl5ps3ht9urma3/sexalupazigonodawuxijojud.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/052210387696.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/43879767760.pdfIn PDF document text
    • https://tonicsuitemusic.com/userfiles/files/86177545866.pdfIn PDF document text
    • http://hingliltd.com/userfiles/36972189198.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/34d1974b93e56b09bde94c1aaea178ea/29075889375.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9c431143f---63816236328.pdfIn PDF document text
    • http://p-energo.ru/content/file/tokoxowi.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/fepotexetimokuzerod.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/60103368073.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/fobasedekudaja.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/53598258478.pdfIn PDF document text
    • https://synersys.fr/contenu/file/rejixedodidimorewe.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/98364598523.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/webumilasoba.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/diponewekadevoto.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/mimimumen.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/zulakubakikivifulet.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/gexigibejiwemosem.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/pewibedomuvoga.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/76772668397.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/68246959043.pdfIn PDF document text
    • 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_off0000b146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 10912 bytes
SHA-256: 364ec8560f75cf316b6c6b0b73a2cb28a1dc04ee7dbdd8a003f1691d08231bc1
font_02_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 15476 bytes
SHA-256: d1c5442d7401fb90d3ebc048cb786995879ed3c0607b50ce5ed426ae35b68121