Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c96e62e5dddf14a…

MALICIOUS

PDF

87.3 KB Created: 2021-07-16 20:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c5d2f9ef5e9b1974014fa2ec9653cab SHA-1: f184193885237c1b62e9d9156132142a2d9eadae SHA-256: 2c96e62e5dddf14ac5487830c1550756a2b1e537240d60cb36cd2ac6be607a0f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lead users to malicious content, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6102e8c50e08a9868cf873957ae5e6f2/86649283190.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071302693601---sejosiketijebubapefoderuz.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/10978844230.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fn2iunfpoa6dqvv2a0plt1f20j/45959168102.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b5256a9b503---22882628958.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/jitixoxut.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/90826197054.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2hita04mb03jtuom93u3vuq3k0/47141755197.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ec51c796d720ad5ca57df4e8ec365e46/57074252780.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944cbf1d875---nudakinajojusimukevasuf.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/guwetixawakinerukur.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6568f7db35---20620899521.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/jorilawowogisefizowi.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4a74b2b1b1c9df1d375772cfda2ab0a3/kejut.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1dae281ed3387594075ed177a888f513/gipasazanovupi.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/48bf0e0acf7f586d0c9fece12f5f77c0/kofukajenom.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/85c6647d8b08d74a1fc0b19a07cfb607/90799359003.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/25236717018.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1287bf3a4---xijuwunibepetamawirepuzi.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/20315974942.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/8952758406.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/muluwurirotasufivojunif.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a34b1b7a1ada7eeb4eee55f29f2ac5ce/luwutulolofeb.pdfIn PDF document text
    • http://planetamama.ru/files/file/53154357228.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/koporetoxifesepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=louis+tomlinson+briana+jungwirth+relationshipPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 11112 bytes
SHA-256: 73effa14ce1f9f0d4bb11508b846bd5a657f978b8f1b53c243afe3e707799af3
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 17504 bytes
SHA-256: 52278b922fc1d8ed1d5cfd87d66e966c94284fbec6b69283a8e96804727a9904
font_02_sfnt_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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