Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de3cfed349c0c8e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 17:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1de418ad0b86ce531734bb4b8091c74 SHA-1: f5922ca499c537736f981cbabc3afbe0ce78d4c1 SHA-256: 4de3cfed349c0c8ead92ac8577b1be5efae6916949cde5644733b07484662ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=pediatric+emergency+medicine+secrets+3rd+edition+pdf PDF link annotation
    • http://valsadindustries.com/userfiles/file/38642844151.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/95840561718.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/tatilame.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/gsh99kebanckl3tfch4g1v8fpk/50467789563.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210718_92768DF3B2D0DF1C.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/velazumo.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/14d88cff909fd18c4647ecf9def2ee4b/9128809822.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c1416ceb573a68687ac4fb2e8677f55a/78366395706.pdfIn PDF document text
    • https://mylodge-naoshima.com/wiguvorowowubejadu.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1625025681.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/kijatu.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/17743516833.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c21569d9b---30202750017.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/912480bff565887fc929541fe3f7bca5/57914605121.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/zobuzosoz.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/fc57f77e45c40c405eda25b80a07c902/58495653611.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/86292571905.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a728fba8d9cc1653d9ad367a3dc05431/jesosusof.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/m32ov4tvph7cakgnqmg544fgpq/34678328946.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/57683384978.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/ruregekud.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/7591658882.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5877831801---mibutenozavevuta.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160848135948b2---6138657317.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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 17920 bytes
SHA-256: 4c1db17e68037e8d19b54b7e5917032281646768f42eda9ece1de568835c7f7a
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 11204 bytes
SHA-256: 19267b83269fe62c154ee7e53bedfca3ad0dc434199a2e631029b561b6f2b072