Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3057bb82d47eb43…

MALICIOUS

PDF

62.3 KB Created: 2021-10-18 16:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8b6147c01ab1f2e9fa0e8bd42d3639e SHA-1: 49e35771b7c50be1272ba509452a256a137d898c SHA-256: d3057bb82d47eb437b5cd09974589d92b414e886f227d3a19f2d70db4f92d61e
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a landing page for further exploitation. The document's structure as a link farm suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8994

Heuristics 5

  • 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
  • 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://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/dapuvixurizewuriw.pdf In PDF document text
    • https://asthasupermarket.com/userfiles/file/fugulinuzekenagexemifef.pdfIn PDF document text
    • http://rilta.net/userfiles/files/nafogafepeguraragaxig.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/72db22a9e05d47dfc66b37e5807d97fa/fevupixesixubawe.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616285cda20db---28028917079.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/37504061180.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/xataretagedubuki.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357dc629022---savez.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/24019269037.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/80877397538.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/391304058.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4dd8091c34c54f865a4f4e8c527be92b/wulazafanikidoxivofelap.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144df8b68799---natibavixaturi.pdfIn PDF document text
    • http://anm-av.de/uploads/files/ximotojikixazoveda.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/27eb56bc5d64637a23179ae579486321/8885925490.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/97433838741.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/kuvetizosexanalomoguloteb.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/87114336939.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/70368049911.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/56b266634108d362f23b02b9ef37e7db/fadovuben.pdfIn PDF document text
    • http://alkanboya.com/files/file///tebane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=what+are+springs+made+fromPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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