Malicious PDF — malware analysis report

Static analysis result for SHA-256 2420cdb176fd96ea…

MALICIOUS

PDF

72.1 KB Created: 2021-08-17 00:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c61520224e3b75593dc6b7a68bfdd298 SHA-1: 714a273242531e4038624b0bfa22840d0d642355 SHA-256: 2420cdb176fd96ea2f14bbe7fff7364f148d80928e27f37bdff444c173882913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5de33803a---suxevofegesakimoboj.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f29378ed1---55321269025.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mbmtfh1nhdmvgl9arp75q81o6d/nerabojupowuxuko.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a423dff3792---38337689934.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a35b8a141d6cb1510467dce61a67d24e/22515681798.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/2261143142.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/69844683647.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4c1693171f807db57990cc76d35188a2/88233959438.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/13896a0c5d8d1defd89a98cb001f02d6/ririsokatuv.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/dovifofumelag.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/75045547299.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/xakofonapinikesekazaganob.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/topijawamubobuzorewet.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e57e23bd9---43716507970.pdfIn PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/46446138776.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jibusexopudulusupemabare.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e56a14405---dinogadunukubutawofix.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4d43b43fd4657bb86a39b0446704d3fc/roxemegolexavoberubosej.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/limijuri.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/67451121560.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f4fe714fdd29f461a3635637620b0a37/72977494409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gjj+hoist+manual+pdfPDF 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_off0000b9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EA 10800 bytes
SHA-256: 86400f107dc8a1170430aeb5c6666d301ab87a80e5ab800015d6e8b2199ac83c
font_01_sfnt_off0000d297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 15732 bytes
SHA-256: 3671895bbd782b62970d20da65667790ab8aa5c40564b04f8a586bd3e98b7354

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