Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3bc723fd6b9eb4…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 04:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c6fe8dc0857d98f90742e69e96460fd2 SHA-1: e601b5d20681798ec59bd3b60fb1f2b744ec6898 SHA-256: cb3bc723fd6b9eb4997f2c24f759fde4b7c48f7298060bcea66cce3318ffb596
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to malicious content, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fskyok.com/uploadfile/files/5904403166.pdf In PDF document text
    • https://ratsimae.ee/media/contents/file/jezoterokanikulopemumigu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/koxemanogo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/sajedawuduvegetunijegumal.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d64947ac05c6a4864b1b99c2093bd6b4/pisajigesidu.pdfIn PDF document text
    • https://pecsikult.hu/files/file/61254269467.pdfIn PDF document text
    • https://ms2oke.com/contents/files/poziparor.pdfIn PDF document text
    • http://erex.hu/upload/file/5775884903.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/fitudenuduwulonanuxud.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/94452797226.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f2e5c322413a593d7b91e022823dd285/putexu.pdfIn PDF document text
    • http://kustari.net/userfiles/file/xofivo.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/pomidolu.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/jeliso.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/waxuwaseg.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82093808c---66370836565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+add+text+to+video+androidPDF 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_off0000aca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA8 16060 bytes
SHA-256: 61c7fa79ff51c2ef5af8a87231dc1bae55137475c9e9ed772f6b39747aef9b54
font_01_sfnt_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 10272 bytes
SHA-256: 2a67e77e3d5cc248769e83aeb63c4a09262ddbb3a435fd73861c965dd011e10c

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