Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb932933857b996…

MALICIOUS

PDF

87.7 KB Created: 2021-07-15 18:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f25cab7b1a5ff7aea2a031f5faaaa3d3 SHA-1: 09fdb8abf51fb3cba2e557f6a627020611150297 SHA-256: ceb932933857b99608583c8a6588abefdf8c55b464060d7e6382760a0fac5337
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=letter+of+authorization+to+remove+property
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa6eab27a---17827550785.pdf
    • http://cphs1970.net/clients/877309/File/22195458121.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/cd58ba51ce6b3da9ce04ee882d7a75fc/60052469581.pdf
    • http://alltechsro.cz/files/rugasapipenikebidijagevo.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9e8da70c---48052609956.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/39142d3db88b9134a1d28088d317ea69/rusokije.pdf
    • https://toskov-yordanov.com/userfiles/file/nijubipajivobo.pdf
    • https://arzhosting.com/calisma2/files/uploads/pilenurogizobitesevoko.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d009e889a6---kobox.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/jotipuvuwazideguju.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ce4cda51b9c674c70b4b5a05dd2a4681/zinom.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a357d7977ee---deratudo.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3340bc1dbf9bea9a418f7c09bb6a1008/39224078641.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1b255ab200c59af98b8ea2799e035306/kejixaberunewaweru.pdf
    • http://rana-international.com/userfiles/files/rolobatojer.pdf
    • http://drkoopman.nl/cmsimages/file/pefimedasegowil.pdf
    • https://mmagame.com/userfiles/file/letimoruxetugejat.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n1fm2sei79c23n9c2gk3dm4edg/detelazan.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/d3gsd548etbpq13si6d5o14gvn/95085274235.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/27caadca11e481f5c27dc4c71d64f020/pisozakuxelesitidobozeko.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2f41039e5420d3976ed5ffb595335981/tefivi.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ce7f262e---35328265583.pdf
    • http://m3hotels.com/userfiles/file/31765360868.pdf
    • http://edu-family72.ru/content/images/uploads/file/kudunenesenib.pdf
    • http://humanitool.ru/userfiles/file/70407196266.pdf
    • http://bonsaichik.ru/images_uploads/files/75424134078.pdf
    • 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_off0000f626.bin
c434e4e476cf4fc449b9fb3aeeb9575624de7e85b39c85024f1d889841a6118f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 16356 bytes
font_01_sfnt_off00012089.bin
a4d163f9e84476f606687922fa36cce846bf3c1d536740528d564cff776acadf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 10708 bytes
font_02_sfnt_off000138f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 16792 bytes