Malicious PDF — malware analysis report

Static analysis result for SHA-256 747404b646b0091f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 06:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a07af03401b65b4e0a47fc7e4f8b1b3c SHA-1: 25a6daa9f43f0f400dfb3088ca5cc4e9552808ca SHA-256: 747404b646b0091f20e3745c45d477692a19eba73e7d2e322972503042ce9ab9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=t%C3%A9l%C3%A9charger+pdf+architect+gratuit+pour+windows+7 PDF link annotation
    • http://shipsupply.ru/userfiles/files/sipopoloxet.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/jedurijufik.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/pejuvovuvapazetimenefige.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/40010799447.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/ribulakuvafuxixivopuvuw.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/bidegorenewixe.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/78246619580.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/52472616265.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad00c9dd4---zamoriwepo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4088ba48857c71fbebcc3fc02985b994/57449322062.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/22162655460.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/vifavixuwanigemasag.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ec1729e---53202539583.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k584eve4658b6iavqe9ka22icl/36122640447.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/lozeduxaromakat.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/jonidulipizebojebado.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/ponanekonedisopuk.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609838de4070b---nejobikufowevib.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/91458632322.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/5444287673.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/kofugumadoxogorofujo.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/9160935617.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/bezodepoxofizupegugid.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/kowilafomorek.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_off0000b660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB660 17008 bytes
SHA-256: 41021ad5d5b5860fdb6ffda60d83a43bdd0ca6935007f428a5e72339a6b289d0
font_01_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 11252 bytes
SHA-256: 18d0c226f70d1d42cbf5231ba60c78a7e14c9817b668d02648de993ad5224434
font_02_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1