Malicious PDF — malware analysis report

Static analysis result for SHA-256 e993ad09e8a4d41d…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 06:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28c38466195cfc0cf581c2b271c7c773 SHA-1: fe8f2a713b9ce07b25ad820a07284c97872fbfb9 SHA-256: e993ad09e8a4d41db73afaf8c36829ae22c610ced31dadca9b358734b1a4c321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to a pattern of hosting malicious content on compromised or untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://como.gattinonimondodivacanze.it/themes/userfiles/files/gadubutafixawirodiked.pdf In PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/jejanajofepuzegotu.pdfIn PDF document text
    • https://kor.mycultureis.com/FileData/ckfinder/files/20211003_08E6275035E4D80F.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a1385b670ac26ce210014ab7f7cb3268/kikuwokebezekedetofev.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/44873804512.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/rugulelogifewixekogudujeb.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7579dac7b390de87f2c0cd30d5ad0903/35340047079.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/69623177335.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/zaxonesizevalutobabukuzes.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ba5d5ab2bc4e1cd2b989f9e4e1e57a75/janudemapidiv.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/dodipepujujapu.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/rofosupojegipariki.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/68074822353.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/55840648204.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/17508695717.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/80343819763.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/zolagetuwovotud.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4f9cdbc79d4c5056d51cf63a608313a8/62960511697.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/73471340656.pdfIn PDF document text
    • http://husplaza.hu/editor_up/buwajepejafa.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/mateforosof.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f64ec4c73e---zonilobebobuzetotuxuv.pdfIn PDF document text
    • https://forssah.co/userfiles/file/64570478633.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/2960865547.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/tirilikevavapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=french+in+action+download+pdfPDF 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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 15276 bytes
SHA-256: b1e5a62240bd6ee7dac473f51f96028e3b37808a7466101d40dd9778ae3a04be
font_02_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10612 bytes
SHA-256: 22a72706c9876dacaacefc52e078e5c00bd855c73832a0f5cf35343f6a510573

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