Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9b067dd8f00c20…

MALICIOUS

PDF

80.1 KB Created: 2021-07-13 21:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 568081c0ef09b89d541ae7386129b473 SHA-1: 1cede457895e7b1218ae0469b96460e1eaffa95c SHA-256: de9b067dd8f00c20a6a95dda498d41e28da2727bee12fdf076123d5b0f65a9ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure users to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://vannordenvastgoed.nl/userfiles/file/65459823612.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/537a24a2e2dbc09360cf4261565a6b97/bonoga.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1q27k8seqa68ab3sut2i9s52i1/66151296113.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0o8qls4f5i0hua0lp34iuun62q/waxejatuv.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b3ba8bfa2cebb83f60bccfb59f28d1ee/13964994618.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5sl8ip98qmc4hftduco90apin/vagojew.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608320874e0d9---doliroromo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d5e4bc1aa---juwapiwitowuwepa.pdfIn PDF document text
    • https://inncredel.com/uploads/65383964389.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/53731549391.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/nonolawuxowixoz.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7773920a2---zefavobor.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/49f962e7f5da607c0a90340a082e1278/74918060364.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c918388ff8---15786313767.pdfIn PDF document text
    • http://springbook.no/files/20656166226.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b34366d085---6627408683.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/47cf5727d47ecdce8dde6444bae006f5/zumula.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/podoxukabigova.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b070f742b3e---dopezotutafotixijozuwixu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebbea78b4---11345064714.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878a9881a7d---boxesebibifoketes.pdfIn PDF document text
    • http://rubensova16.cz/files/file/70716268297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=international+conference+on+computer+vision+theory+and+applicationsPDF 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_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 11116 bytes
SHA-256: e503e185131a5eb673dbab03b1f22fbe55cd64b4c12d3085413242543a9f7707
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 17420 bytes
SHA-256: 2585651586a3228f4630a9fb9464225f84351bbe626da98c66486ca0a09c1a6f
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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