Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8b0d1a3b00b45f…

MALICIOUS

PDF

99.8 KB Created: 2021-08-08 13:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f38564333624c3741bcb462a35da1757 SHA-1: 96bd7bc397030f919739a2d1eaaa8e0fce6e990d SHA-256: bf8b0d1a3b00b45f9f45367d3778c4f3229e31181b695b688d78f2c59c606e9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, though not fully analyzed here, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50bbb55e2---funusebu.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bc8c210b---55637377437.pdfIn PDF document text
    • http://siembra.me/uploads/files/witup.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed68790e6e---duxojapizokagarutebavepe.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/jawivew.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/jamokifuvipuninegitemonu.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/36734541296.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cbc87a26c---8620600777.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wamuxafonotumunasosakapu.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/fezaviperefafimujazutak.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/8add1d395113898c76da5222da90cfdd/56319003308.pdfIn PDF document text
    • http://iltorg.ru/upload/file/14894698894.pdfIn PDF document text
    • http://dakmet.pl/upload/55026546708.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/rogolowaxepoza.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/798pdl3b8u3abl9i99g7q8epfs/laluzuz.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/2086098528.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/6cf15dc867fe94674f94f05bf129297d/82417144174.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e9497224---pewojedufixekagoxepobo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075556f11d0e---830709205.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1272ce017c590cfbed5ec3334e297843/vudixaxuriruvo.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/soduzafejodatiti.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ed3612e72c179032307d35d27f75b214/dudabujerovuwofexomozelem.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/87870092057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=google+hacks+and+tricks+2020PDF 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_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 18008 bytes
SHA-256: d154cd6d9aab482fd9c6d306b532ea0b180fb4586113f1017afe08e4853741e8
font_01_sfnt_off00014ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF4 11020 bytes
SHA-256: e418805f85256074a0fa1a90bf61fb311380b11896027a8d66dfafbed0345e26
font_02_sfnt_off00016874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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