Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea89a117a22d005…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 13:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6cf215d7168a372a434df14ddb0e444 SHA-1: 5170ef358efc1e9e8c2ea81c3e7d01d63ddd8f4d SHA-256: 6ea89a117a22d00544a09224d57bac7e426a9f0432dbf3f8e493a4bd9df3f64f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=sexy+baseball+apk+download PDF link annotation
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/81021131283.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a651b52cf---sokufipuwi.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/vipabu.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/61122685990.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/94578759335.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gikovade.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pigosuv.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/xabotadumirego.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/takadozadotirigitiz.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/fokife.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/40024589852.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/geropararinomozuriwiput.pdfIn PDF document text
    • http://hotstamping.pl/files/file/tasazudab.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/sefosijarokawarig.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/kinawib.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/85968938106.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613933396fe88---mekopumozefikakamotuw.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130947e87f15---tixijupag.pdfIn PDF document text
    • http://perfectprojects.ro/userfiles/file/jibedididizufarafunigef.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613493986e349---newiduka.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_off0000c421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 10704 bytes
SHA-256: 3cb770d49e174a218aba229c74bb2f386b5ff562b09ba59e5c29b704c30cfde8
font_02_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 20364 bytes
SHA-256: b93e480f41a32ea864977293fca736c46eff70b827cf1890384ec69db5dbdb57