Malicious PDF — malware analysis report

Static analysis result for SHA-256 391ba181edcad8ef…

MALICIOUS

PDF

96.6 KB Created: 2021-06-30 00:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5adb5519d33213299c7f818508cde815 SHA-1: 6376caf2336678daac936532b3fba9d43d2b99f4 SHA-256: 391ba181edcad8ef583cd379615d8b2ea5c2e72b2518b255c437db212961b524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing malware or leading users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c87d4f288f5ed353f0c4736ac35bc77e/27985237551.pdf
    • http://www.cbs-emballages.com/upload/file/pivovadiwumujiribugeket.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d45b0b6b830243dad9cb2b23a6fe8f8d/vixegavakupovinadat.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9fgdickifmvlkbs82p6jq0hqjg/tizised.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3852d7422a432cc8e6047677af4a3fd5/givemubikok.pdf
    • http://goref.ru/files/file/92590821129.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/ropuzorovodepo.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81755a604---50223781291.pdf
    • http://ytbozhuo.com/upload/file/120132552366.pdf
    • http://skiflogistics.ru/userfiles/file/49743299659.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608866e46c3d7---wuverawetoj.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f812f7a0b5c202edb73dcd290e66d98f/24564141800.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/62e259ad5db4f5db7ab8ce765545ed10/76938651366.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fcf7d68cffa53ac0665746eae6869667/88926460461.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833b54db2b4---lusakunulatoxeji.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/55647ec6bfd020973793f711574770bf/53157042309.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd58262ad04---gazebijafisulopupazoxi.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572a872a67---vatibirogukobusabodugabeg.pdf
    • http://www.sport-konyv.hu/userfiles/file/37092953543.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/84a0a45a65a35f3e1c908fdc01072135/wapesajelineguvi.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a915b6d6415---6140405585.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a335212def6---73728740379.pdf
    • http://www.radio-kum.si/data/files/wudabesibojefesugaso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+aimbot+on+breaking+point
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011456.bin
019fa0a95b8bc6c51d31391ade3cf119d4952e13c29e9859fc3ff886bf58e0a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 10692 bytes
font_01_sfnt_off00012ca1.bin
a176bee1941dd1e285703cd5857958c190e9206b52f93d193827f5a896b79173
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 18564 bytes
font_02_sfnt_off00015d14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D14 16792 bytes