Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c127e73d5b43c2…

MALICIOUS

PDF

88.5 KB Created: 2021-06-27 03:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6cc5dfa957c00da07f1ef9737844b1d SHA-1: 93093ffd8d364998e0745b6699edb34278676592 SHA-256: 23c127e73d5b43c26811f7a08ed73c45a45c00d6562d27a6e5655375daa2ca46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malicious content distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=job+knowledge+appraisal+comments
    • https://247christianity.org/fckeditor/userfiles/file/monina1621466759.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9hj8hkma0v0qpq5bqtfglt31b1/gupabupizapuxewarewub.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab30323c7e4---83296289730.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97a74b07b3---ponewuvu.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff29af72a---wedarenokogedelurira.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6dbc3f75---jizon.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86b2a47f8---47183900705.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2e3c52a0---kevudu.pdf
    • http://kstarsmall.net/userfiles/file///64546695687.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c6c00186c---65447438190.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160854325d023d---duwonogidovosi.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba262f7fd---jilumefu.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dca483fd1---70653845907.pdf
    • http://aaaexpressheating.com/userfiles/file/29564739045.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vh970vlvbfgsa3cei4kieqhtec/vuxikokakidabujubifuvojev.pdf
    • https://alarrabnews.com/images/content/content/file/wupujobiledagoroziveluxi.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/18e064e51e8ba5f763671f0805c5fcf0/jodogaruziro.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a11c90a1028bf5c76460f133446aeef9/36490002945.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1609102387---mefabitesugipebadiw.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8d6c95bb21d978ddbf82390cabc7fc69/33053680967.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/o64vk8votsvhkl7lb6gmtdc4v7/tixazo.pdf
    • https://systematix.pl/userfiles/file/nujasetetifisu.pdf
    • http://bagiez.com/userfiles/file/dazimezexiko.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/1d95a6c15b93230f4991ebe63e3ca290/vevalusiwu.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_off0000f6a9.bin
50918880f7f33b8a7ab9b9e1b656a2e3c23b676992e1aa26c4771f1deb45af84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 11168 bytes
font_01_sfnt_off00011063.bin
92070f18bf8a2aac3a958f28ac199939cf6f82bcc7ea1bbb1c71e78cfd65c7fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 17144 bytes
font_02_sfnt_off00013c8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 16792 bytes

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