Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf3450a3a341712…

MALICIOUS

PDF

93.3 KB Created: 2021-06-29 04:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c794b4bc37b011bda218319ca49d426a SHA-1: e79345c5109e46cb10421d40211268e69f571150 SHA-256: 4cf3450a3a3417129c8c01c74b371e2cb96598db4269a51131b9798324a02e7d
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a 'Remote-support tool lure' heuristic strongly suggests the document's purpose is to trick the user into installing remote access software. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, likely aiming to facilitate unauthorized access or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://medvor.ru/uplcv?utm_term=last+undefeated+college+basketball+team PDF link annotation
    • http://optykglowacki.pl/obrazki/files/2163004187.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9hfia62152jc3tqgeqri9ud19j/dipisuluweluwo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/29821837589.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6d672e76142c5aa3fa67111dc76ad11a/rukaxifomutuwez.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/tamab.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/19273045726.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088543a13142---81254404860.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/noluwenefofajaxoxerimal.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/747b4ae2f475f61fd606877357745796/34751935644.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210619131127_g6ilgi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b67cb443---91655856812.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d01498239---40064113750.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/57446052441.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/sijiligibo.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/75396641139.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/15671838434.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9acbf2fa8---fawitesuxagepuvub.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7ga6ot51gg1ko1348cm9j8mj36/28871662946.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/49399460301.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/1b69c1068ef24fee5282b5eda3a21ca3/60675756037.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/pevaxudobagijedorugaraku.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3d96ptq4eegr0nlsbi84pgj594/lisimilebumelosexebipupe.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/xafusajababenowajixagaki.pdfIn PDF document text
    • 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_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 17660 bytes
SHA-256: 5094aeb498d5dadf6a277555286e7b430462eda5324f4ed35e0defe29cb5996e
font_01_sfnt_off000136a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBD 10916 bytes
SHA-256: d3a2066fa82d93b256f97f07a63a8207c4d24d29fcad6c69015200d02c21da5a

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