Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c200943bb462e4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 01:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c80344f6e7114a72c0cd2cec5fdc1e53 SHA-1: d8c2f496b3fdfcf6cb7d23b3f9b6e0b92657e405 SHA-256: e4c200943bb462e4c158931004ad830fccac970cba01bf0a3fbef2bb224a1fbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely leveraging an exploit within the PDF structure to redirect users to malicious content.

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://krisoc.ru/uplcv?utm_term=bomber+friends+offline
    • http://tysons-cafe.com/uploads/files/wiwem.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335482d5900---95614487371.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa56726aeb---36175049832.pdf
    • http://brainbond.ro/userfiles/file/vazeromibumod.pdf
    • http://dansungsala.com/uploads/files/fodekojobatemenomepi.pdf
    • http://masterref.ru/editorfiles/file/wetesosufonasaw.pdf
    • https://incoyun.com/calisma2/files/uploads/68549001023.pdf
    • http://fueandhair.com/userfiles/files/zulezep.pdf
    • http://nanopena.cz/upload/file/nizevafovojexososos.pdf
    • http://adance0112.com/upfile/editor/file/desomovipotikumexozuza.pdf
    • http://levant-tekstil.com/other_files/File/todufukevu.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9e159e3cf1b58358b99eb9ba1f6d3453/navezug.pdf
    • https://quanghuydulich.vn/img_duhoc/files/gugezomix.pdf
    • http://sushistoryus.com/uploads/files/61254893574.pdf
    • https://otoform.com/upload/ckfinder/files/84179364753.pdf
    • http://alacarte-design.de/userfiles/file/39284159313.pdf
    • https://cauthinh.com/luutru/files/tukejifovisuwezaz.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614030558b47e---senakugokemegifol.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/gujaweletadi.pdf
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/88050044557.pdf
    • https://jocafoto.com/fotos/file/60118438983.pdf
    • https://fultoys.com/userfiles/burigixi.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/51584855404.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316818a3649---zefekomupedajoku.pdf
    • 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_off0000d09e.bin
daff1eabf699daf352767a63bf479ae829fc560d1e34a4c7efa38800bdf6dfc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD09E 19872 bytes
font_01_sfnt_off0001059e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 16792 bytes
font_02_sfnt_off00011db5.bin
69a114eab813dfa2194f026999adc27ea73386a7b8dbd7a5614d516cf792b1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 10448 bytes

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