Malicious PDF — malware analysis report

Static analysis result for SHA-256 faefbbe0d021bd73…

MALICIOUS

PDF

77.6 KB Created: 2021-07-04 18:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: add7f744504908c1c22b27d30fd2a13e SHA-1: 9e885d051b78659213f7995f4ebf4de9317343f4 SHA-256: faefbbe0d021bd737d8aa5b15d5ab51b0b0eda50a309f377c255136eaec29891
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://triangle-electronics.com/assets/userfiles/file/luzof.pdf
    • http://gintaras.cz/userfiles/file/lawabuf.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/28728275231.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/da1e38c882dcacf8a54f520d156361d6/renedekejakufevixaba.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a334146a3c8bc0451e7b46ecd504493d/fujativixasiwebuzu.pdf
    • https://daotaolaixesontay.com/uploads/file/pepajifemexisojepobom.pdf
    • http://www.tramag.pl/upload/file/1964213437.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o1l6f3qog7dhu9h47e7cva4r45/pitirekesewikodi.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e447f1e3e6---zumidoser.pdf
    • http://liyangah.com/Upload/file/fesitamuxijiguwubi.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0957782783---bixogonipewigejago.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7fdf16d88---misusem.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8b362374---mawibexikadero.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/ba10caa0c13fde5585e93238db32ae52/kewawomerupusiforosatade.pdf
    • http://geteffective.biz/uploadfiles/file/xovakakutexivo.pdf
    • http://3xlove.com/uploadfile/file/rufudokozaforavib.pdf
    • http://hanleyresources.com/images/zesogudexiv.pdf
    • http://hanhthien.net/uploads/file/buxutegaje.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c856ed04684---sewuv.pdf
    • http://adaviestransportltd.com/userfiles/file/seledaletewedupotuzet.pdf
    • http://cs-golfclub.com/ckupload/files/niwibarojudirejedosozuz.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9d4c34d5---pefukosuwazoguz.pdf
    • http://pamat.ro/UserFiles/file/mijijinutedizekujojeduge.pdf
    • https://iwanbim.com/userfiles/files/likosilawodet.pdf
    • http://afgventuregroup.com/cfiles/file/xovomeburotilozupug.pdf
    • https://mfdesign.hu/files/file/83939066205.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=king+air+b200+operating+costs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 16792 bytes
font_01_sfnt_off0000e26c.bin
391e829aba2df3bb14584606731826dd3801f2e82f9970c6eb930e1972946141
pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 17304 bytes
font_02_sfnt_off00010ffc.bin
3b86f4a4a3d305790fed811b453a5cc706a3fa32c734903f212c92259d6eef11
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 10876 bytes