Malicious PDF — malware analysis report

Static analysis result for SHA-256 3759e9c3d92c68b8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 16:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e892726d01c65e84c56dd1644feeebb SHA-1: 11c32865544df9fdfbca8a65b6699eeed67845fc SHA-256: 3759e9c3d92c68b83590c3dc7168133ebc07d73419434c955a7a03e796859c1f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://avon-bratislava.com/files/files/80428917189.pdf In PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/73593541218.pdfIn PDF document text
    • http://masonhn.com/d/files/mabedatalukiketusebubev.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/dotuzekelidamafoxokubuk.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/4125470448.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613250dd41bf4---65622390052.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/gidikosuzatovepib.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/gobivigino.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/58711140294.pdfIn PDF document text
    • https://ms01bet.net/contents/files/68533121338.pdfIn PDF document text
    • http://01host.ru/userfiles/files/98485791785.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/bodereje.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/ruvexu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c14fd38894---63742797136.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/koresetinozuberix.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/18263555331.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/969a679852a82237e98fcae7509d863d/65608184327.pdfIn PDF document text
    • http://kgmda.com/upload/files/39208201138.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/gutufowal.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/12022983047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pixel+xl+developer+optionsPDF 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_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 17364 bytes
SHA-256: 56f71d21e75115814ff4a51f2bc3459690052dcca4b14b515f10564453b87cfa
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 10392 bytes
SHA-256: cb4d550c90b4ae9682b6690d66ec14c587806ec9ffc844b53f9757a1ee066b5a