Malicious PDF — malware analysis report

Static analysis result for SHA-256 192f24e7f89943bb…

MALICIOUS

PDF

85.2 KB Created: 2021-07-19 21:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f4ad3922e561eea48593cb9527799d9 SHA-1: e9d68afb829f90d9f1fe09e2b0e2a9934498c64f SHA-256: 192f24e7f89943bbb27805a671fdb0ca1a30d8b8399f4a3df42c68834fbf2831
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. No scripts were extracted, but the structure suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c4193b0a43d1e9e24f00988da2a6a723/8865721453.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jbeagmfqarvu4lj9bolr8066c1/xigumukaj.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8effc5014---57260350952.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/30820043310.pdf
    • http://studiomalpocher.it/userfiles/files/86587427065.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095816f2ae0c---74998240317.pdf
    • http://2440027.ru/upload/file/bepewafi.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076608c6bb98---67713830676.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ec28fb7a---mulugixitafulekizifagad.pdf
    • http://nmglyxx.com/userfiles/file/70697524040.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/06b21baa793d8853a0fe23cd331bf1fb/38404197722.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a130be68bc1---15491970559.pdf
    • http://tcihk.com/userfiles/lebudejedalov.pdf
    • http://goodwill.pl/userfiles/file/fegupa.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714eaca9da5---74490569716.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da04c03b94---tufezem.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/zejekasujawazajotew.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/49265a6e57f22d2e8be7e53b6682b1cc/bulugeresuw.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cb7d5696e---mekazara.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ee650ba2335---lugilagadebe.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9022436b98---54560223059.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b9ad26bf8---putuborejakagefosaxid.pdf
    • https://www.alapan.org/fckimages/file/bomavusafaj.pdf
    • http://asokmontridental.com/userfiles/file/89237214136.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=minesweeper+similar+games
    • 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_off0000eb2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 16792 bytes
font_01_sfnt_off00010341.bin
b8c2ef6caef4cd56972af642c743e82aef1c2a7c2c6f17027e60911f68c0ca4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 17044 bytes
font_02_sfnt_off00012fe8.bin
abd6fa416717de2b0e819c3f1c0d5b9712ffa5ff8d9b78ed9f45f4173197d5f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE8 10456 bytes