Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c3a7ebce10a62a…

MALICIOUS

PDF

81.2 KB Created: 2021-08-26 05:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64433feeb5259f16ef0b3e76fceda2a3 SHA-1: 9d784019bfad07ee0641fdec3c63eebd8085d06d SHA-256: c2c3a7ebce10a62aada015b25304c6f22e8eb78e277803a51798c12fdbbeebff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://zimaletto.com/uploads/file/zexod.pdf In PDF document text
    • http://ccforum.kr/uploads/file/1624269822.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/11025932706.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3186f968bdb1cb6090332ff2d18adf8/mapalosuvejuxo.pdfIn PDF document text
    • https://podimercrm.com/img/files/zogurawubiregegisora.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/19259046210.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c05063c2729aaf1fc2fe3960a8438a4b/66621119357.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b5b8bb899---bosawogakuxak.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898f665d7a8---vobamomusujawajibaw.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/xomoxexerugusejezumuvo.pdfIn PDF document text
    • http://sushi-belovo.ru/files/15192100536.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608445941d41d---36330224204.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/luxurusivakapifujokidawom.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/vagira.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/narimazujadumivabud.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/98379988121.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021081618455212.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/wegatisazapa.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/crf3c36983iv860ub7b8084l8p/52919815343.pdfIn PDF document text
    • https://apizf.org/public/file/91831379575.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ugdkrb4n4lcniapmqrondc439/nogewikepakipo.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/11016208794.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/tisefivanebugebiti.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/33293992020.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4b75af7e6---18010826073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=clerk+of+court+conway+scPDF 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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 17112 bytes
SHA-256: 449753bb721f7943509598c28d87528446125b5bc2344014de59ebf3f39d8f8d
font_02_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 10660 bytes
SHA-256: d388edba7c4ad25a93d7a5a503d2c9bd4c05030bcd9435f08c215e98fe48f687

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