Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9e935a738cec59…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 05:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5c27f52c2209ca47f51fd64e7c0e8bc SHA-1: 8eaf5cfcbd17a450fb0fd06723fba87c2c308077 SHA-256: cd9e935a738cec594c129b9f104f5ca4898b1280ea6e3af30e5fc1b7e077beff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being part of a link farm, directing users to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://drafthe.ru/uplcv?utm_term=would+you+look+at+that PDF link annotation
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aacf0d0078---53414498535.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/35369426084.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/lenopuzonasafopikijuv.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/26052718821.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/27447023484.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/13900963467.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/tawozexepa.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/68009164463.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/mobesenosejobiduvaxanovim.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148c34e5cc8a---vilulenezuborozofozojidi.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/vopetonutuzin.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/74281534989.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/54930255927.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df757a1beb---vatudita.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/864j2j09t3ud0asufajn2er0t2/14685639965.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/milafisojebikuxobi.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/vozojukajoxas.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86f37cdde---netudom.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/rulajebedofijozesoj.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c21b87ab9e---16724426192.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/58690549937.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_off0000b057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 10048 bytes
SHA-256: f8251ea59f7c30b8a5c02397761a264b8e986455136f61cd75c01e0f5d776599
font_01_sfnt_off0000c6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 14460 bytes
SHA-256: a909498da073d9e3bd9a71863aa68cf29cca9d9ca023c7d66f7c383712a2daf3

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