Malicious PDF — malware analysis report

Static analysis result for SHA-256 2351953e5859407a…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 21:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e30cf6e49b2be2592564521df003288a SHA-1: ec65ec47a8915b2a3a2d2b11d9da0e7292d9cbc2 SHA-256: 2351953e5859407a56bba1b4d5d12d17b52869bd95e1c869542e97f9b4ae80d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16152288a85583---454409831.pdf In PDF document text
    • http://moto-bike.pl/userfiles/file/86625916303.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/xoduwavat.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/80501567381.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/91546835114.pdfIn PDF document text
    • http://egitara.com/upfiles/files/51035908506.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/14738709402.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/likeludominesenobigabuwe.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/lapebegeviwuj.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/60301705036.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4339b8059---94488051603.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/nebunuxadiwunado.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/17009858961.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/26913262372.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/18568132869.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c203519398---64406992449.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/puxawefinawel.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/23514853080.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/sirup.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gosejidulewiginiwegojar.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/32556793239.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/77679553087.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/tagif.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/93695059333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+the+word+disclosePDF link annotation
    • 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_off0000b2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 16156 bytes
SHA-256: 3997148e753cf7b660dd30ef1505668720a988204b4240f3c93b8df6b7b0c91c
font_02_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 10836 bytes
SHA-256: 289fcb18f9b570f93789100837606f1400de99af85725a7fedc7e04f585fa12f