Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7770a38f1788dc…

MALICIOUS

PDF

99.4 KB Created: 2021-06-30 05:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea2f48a21fc1fa1611fecde35babe54f SHA-1: 36a4a72405f98020ecefb3b40c27d143cac2d75c SHA-256: 7a7770a38f1788dc448e2dd6923deb365971384ae7e9c59b137d2f0306b6e393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised websites suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a5414b777d9---3194582523.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97222c0ee---dibavewez.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7464ae62bfc8d7a0c57195d837cfc277/81735669601.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/43587672272.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e8efa8b1eddca9fe101e21b5fb942f78/48223601299.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/245aca42afc5be03e019f681d2d7b17f/gixiw.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4gk2u9108736jale9tfan5vo9l/joxasivajulegoj.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cf04c3b82c589d7d70d1af250a905755/pamebeto.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f94fd5dcb21e77ac270deef99b8a1604/topapisoxejoredidurev.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mevufq1m3hsl1r0ej48hb92si8/75085035698.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c13e4e33a3c783c7e3e1cbcd1da2db7b/89199454022.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fpgisii7ug2j54idibo3ii3qal/86765103034.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6031d1a2b---48782474291.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4bdf01eac---56916469535.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c5743a21c1a---wipalazezowinuvip.pdf
    • https://gachbinhduong.com/upload/file/bewiduramugadozanilif.pdf
    • http://honda-vo.com/upload/file/fixirir.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07c95d6ad---tidunezi.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8e7bbb77b---xitabejibamenijepa.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/4a23b117e88d06998d639c6725bcd0f8/ronufologatekisonebe.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/1903812365.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/sujugitofapelomebulaniji.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb32059216---goderigadopizasesifub.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5157a0a7dc---mubizenobazadasuxorub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=red+hat+linux+questions+and+answers+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_off00011ee8.bin
06c19321176aeed6095def3063b471cb8641df2eb18d83de050f3031c7e3ac93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 17988 bytes
font_01_sfnt_off00014e6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6D 16792 bytes
font_02_sfnt_off00016684.bin
5ed84ce5bf9105226026fb41e42ebafc2858fe2ddd781eaa8ea98afeca70633c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16684 11076 bytes

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