Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a99453134ce194…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 13:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f00ef092edbf8c468d97449fd4932d0 SHA-1: 7a8628fe07d2864dd9902ed23f6d955d1fcd16b6 SHA-256: 86a99453134ce19497bdaac7bdf60217208b7be22ccf4ae8358d553f8c6e677e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=physics+at+work+book+2+solution
    • http://azs-szermierka.pl/zdjecia/fck/file/murogakogifuj.pdf
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97747029171.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155bb2e05442---83855151198.pdf
    • http://skolicka.eu/foto/images/file/depevemetuwiwizison.pdf
    • https://sukhayurveda.in/userfiles/file/woleluzazepipon.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5f66e5ee2fc58e21e75785e1257f222f/sewefobukatuzelok.pdf
    • http://recit-de-vie.fr/userfiles/file/69175763502.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/26245146344.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/27853797730.pdf
    • http://transportdiverse.com/uploads/files/69461233902.pdf
    • http://lideparts.com/userfiles/file/1631010224.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/vikideg.pdf
    • http://usefchina.com/uploadfile/file///2021100114513327.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/lobowosi.pdf
    • http://jrpst.pl/userfiles/file/49635447843.pdf
    • http://texinpack.com/uploadfile/file///2021092820182421.pdf
    • http://a9188.com/upload_files/art_files/files/20211001_123639.pdf
    • http://orderkai.com/uploads/files/luvumiwagunuwelod.pdf
    • https://cancelaria.pl/galeria/file/32850609600.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b3d64d61---xarusisab.pdf
    • http://webminmax.com/userfiles/file/96054362495.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210929_DA459FE421FB4728.pdf
    • http://bandenplaats.nl/cmsimages/file/85825215503.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_off0000aef4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 16792 bytes
font_01_sfnt_off0000c706.bin
c045b6e4da2611cbbf7b3d504b598be65b0a90c44264a608df53f649bf07cd1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 16992 bytes
font_02_sfnt_off0000f2fc.bin
7c7a1d57f9682bc47f9d84f6db5ea553ef711f04a515d6e87ac4030152578573
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10848 bytes