Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c57ee2a3436c0ca…

MALICIOUS

PDF

81.5 KB Created: 2021-06-27 23:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddfcc81c3f3ef948d8f380c143f7042b SHA-1: df30d02d3e494565f0302410ca91b9c6ccb70f88 SHA-256: 8c57ee2a3436c0cadc46d39a5fd22e3293ad1fdb3ff006cca42738dcc5205a27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=a+white+bird+with+long+legs
    • https://pet-fashion.ro/mm/file/retivonaw.pdf
    • http://digjamaica.com/app/webroot/files/vovirabasuzuziturok.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/76745628907.pdf
    • http://aihyang.com/userfiles/file/nowotajajasonemojikivezim.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fowib.pdf
    • http://adabaskimerkezi.com/upload/file/8499267936.pdf
    • https://tonwen.org/userfiles/file/12951432988.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7b671b32e5163eb7eeda9f3668ac86c0/tosogep.pdf
    • http://dgjst.com/upfile/file/golazipalokonusos.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c009fec2900---ladesuvopanekuxirif.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8d5a7c4ce19496b2d8fbd040566c70cf/nusenazuranozasegolobib.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/47933809080.pdf
    • http://mirai-kankyo.com/userfiles/files/655406696.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2187dc06---fufezifejifunufovurafo.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/06e6717e429c49b25808f0299e02a7d3/dubixelelisimunezib.pdf
    • http://xboxheerlen.nl/userfiles/file/zojovim.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e8c61c06---65666739975.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gupefepaxizedam.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c84a344fd---mirefuxoveki.pdf
    • http://sns.hu/_user/file/94988651090.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffed88da8d---timanowemozekifenamum.pdf
    • http://hopkinshigh1961.com/clients/878968/File/loremonijavediv.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075374becc15---16095923941.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8ed22c8ae8a7e1fe9068025dd4a17dfe/31060760850.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_off0000def0.bin
ec1b6ccb09131735724f6ec086b014c82fd0cdea0dfd2f64c1837534399ef286
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 10572 bytes
font_01_sfnt_off0000f6d2.bin
8b3a15ba12eb494d71fd51a564e4579f9d4cd3a9c86141a2c8387e246325f19b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 16200 bytes
font_02_sfnt_off0001206d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 16792 bytes