Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64a29e23dcbb531…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 18:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d6f618f18d32c68f5731290706cdb3f SHA-1: 3981870b2582fef529a71210cf4a388ebcfaecc3 SHA-256: c64a29e23dcbb53106775f4c5c1fd40c127178b386d43a111c52633f14d0555a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF format and the nature of the heuristics suggest potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://okud-istra.hr/userfiles/file/dekoxe.pdf In PDF document text
    • http://kpotplace.com/uploads/files/94699190100.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/50233800604.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/ririkisanefizodiwi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3a481890b---72473866307.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116599742070---ziberirenimusoba.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/geniwutavuzanawuzadusuv.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6bcmph5d2set4c7ggtu7ru7kc5/pawekixisolunijimexunenub.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a44932656---84522904448.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/64854413539.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/rv24qts7aqqq7vaq8roemti1t2/24144409931.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///pumamajavasasuzakufusov.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/gotokagusaruzelizeza.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/94454048716.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/vivujusobatawaz.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098404740b5a---28429373837.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607522283dccc---15346314825.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde74b6797b---saziwixaw.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/simogalomuworesezos.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/61387985488.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9106c66b30f868d6e9b1af50078dae72/77670476107.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/99105343964.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/pedudud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+to+mix+to+make+purplePDF 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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10532 bytes
SHA-256: cfcbedf7d253ce44e3311ff8d31e4bb0626626dcd9d641234ce4aef29ab73bf2
font_02_sfnt_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 17368 bytes
SHA-256: f06a98135f39114060f2820e32ef2f83bdc405a643f9a52a37e5a222e829e055

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