Malicious PDF — malware analysis report

Static analysis result for SHA-256 376de09106d07e53…

MALICIOUS

PDF

99.6 KB Created: 2021-08-25 08:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 257d0d8b2d47443e6399380d455f050f SHA-1: 58920368124d8c0b833230031027732fe5647dfe SHA-256: 376de09106d07e53778477804587cefbb87c1c0f3f126dca1ba20320d603b2d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised CMS upload storage, suggesting it is used to distribute further malicious content. The presence of multiple embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://aadhaarretail.com/administrator/imagetemp/file/jenikakazamakavek.pdf In PDF document text
    • https://maxflowfans.com/userfiles/file/gijeged.pdfIn PDF document text
    • http://carszana.com/image/upload/File/mebawasor.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ce6b91183339d93db8eb8fbff9a0e979/pekagovaz.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/fiwojigokuziga.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/neneminaxegixi.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/bifozedilajow.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/jojena.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/52659115805.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/65591f481dca6fbe33dc8773a3510ffb/57551581756.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/xerajexewaj.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1b07b50ff41a854f88692f9496ad4eb4/83610465615.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b112e8e0c77---39677115195.pdfIn PDF document text
    • https://wumusk.com/asset/uploads/files/vunop.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/zirofukerakijasen.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jmuj9mb7mbkodj6g8g0ib4ngc5/36253410646.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16109fbd167061---toreserilupa.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a20f1938---nakojexosukomapabuguvaram.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123be0e3d482---pukotolurabaxoxapepib.pdfIn PDF document text
    • http://3asoft.vn/img/files/fibulisedepoziv.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/106729a73c8e33a1cd387cf402b52e0a/13877322.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f6d7864c7c042dce2713825e5bb513b5/44198046888.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/lojusov.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/2650901721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=midlands+college+application+forms+2021+pdfPDF 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_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 11248 bytes
SHA-256: 680636e8aa881283de216164b52222cf09eb2d693447e87534b0fc8854696718
font_02_sfnt_off0001502a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502A 18528 bytes
SHA-256: 1c6b788cbb28dad59e31b7de89a85e894cb01712ed075e16526984d51b19d27e

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