Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11583f11c90e857…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 13:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2a5c884f5a7bf08ac695f8272ee82c6 SHA-1: 0f538f2b87f7aa3946f85119446b1e8c575a2d62 SHA-256: c11583f11c90e8571431249fa18cb2079332bf674ef4a515843964e1d5a1480d
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and trojan payload. It contains embedded JavaScript and multiple external URIs, some pointing to compromised CMS uploads, suggesting it's part of a link farm designed to host malicious files. The document also explicitly instructs the user to disable security software and provides password instructions for an archive, a common tactic to bypass gateway scanning and deliver encrypted malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=prince+of+persia+warrior+within+free
    • http://hotspot-usa.com/js/upload/files/73842574115.pdf
    • http://amsasecretariat.fr/userfiles/file/35503523155.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b3747013---81158767306.pdf
    • http://sinhorelli.com/userfiles/file/jibugaz.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16139310dc5121---10920894267.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/90744267486.pdf
    • http://clinton.abwingsmd.com/uploads/files/xisupedusesaxopatonu.pdf
    • http://gniortho.com/files/Upload/file/35348076055.pdf
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/guzolati.pdf
    • https://xn--b8qxb801j.tw/upload/files/folirigasowukagavujuvata.pdf
    • http://yds-wcv.jp/free_images/files/98508363474.pdf
    • https://kozlovka.mebel18.com/uploads/files/dawukuxuxirofipejo.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/lamukutegeserodam.pdf
    • https://pushtypathshala.com/demo/aims/files/images/files/15913499655.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/577346757.pdf
    • http://vasekurzy.cz/userfiles/file/nuxexugubugore.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/80981437345.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/69473596255.pdf
    • http://www.addvanceo.info/userfiles/files/kejoginulobaxax.pdf
    • http://wakabaeducation.com/userfiles/file/27415525454.pdf
    • http://garage-fuji.jp/js/upload/files/43120490798.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8dac0a07---17205118365.pdf
    • http://montazenabytkupraha.cz/files/file/6262687320.pdf
    • http://crystal-lamp.ru/uploads/files/kuguwosusilosovisetu.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/pijowogimigupakaxusuwoba.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_off0000e34e.bin
dbc4bf6fed7ecae655a94be541b5a5ba59d087ecae55ab7d7dd5760e07329add		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 10620 bytes
font_01_sfnt_off0000fb9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 16792 bytes
font_02_sfnt_off000113ad.bin
69c3098a918599e647379dd55bf961efbee64abf1b41ffcd5a68960ec5f99abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 18444 bytes

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