Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6cfae97e61f91b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 11:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f5d8a3f33592c481ae0349f0d2d6d23 SHA-1: 2adfd08ed9469722a3a84a56ebb633c527ff352f SHA-256: 7d6cfae97e61f91ba85404285e84baa9db30f6e8128ce127eb418c8e2086ebbe
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 are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=android+color+filter PDF link annotation
    • http://eunlocker.com/Images/Editor/file/gotitonolijoforelofugoxi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da77f90a6e---44948161830.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/96538552733.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/97570659449.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/edde51a7210b39b83a891721a7fa027e/potixusu.pdfIn PDF document text
    • https://porfic.com/fotos/file/67503195049.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/55826762859.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8289ca0c---43919095419.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/89032948612.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/beguwuremuxojubifubage.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/32491415880.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/luwovodotik.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/51348282834.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/ralirafuwi.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/juriv.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109051525455391.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/dajakaxinumepukizib.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613139d1c9102---gewoduseg.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/81646663702.pdfIn PDF document text
    • http://flomojapan.com/upload/files/sozupilexofebakuf.pdfIn PDF document text
    • https://lecachet.fr/docs/files/giretifopuzakuzuliko.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81059621774.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_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 10120 bytes
SHA-256: 4194b45640f5db3d5579092aecded7f558ef370f67689f3719173980b4edf88a
font_02_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 16576 bytes
SHA-256: 27de4b20b212b66b88e9b6d72f5f4f5a6849b8f5d9593eeb8918a0d7e3f2d752