Malicious PDF — malware analysis report

Static analysis result for SHA-256 438f5cd8bfe9e9c7…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 12:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6b7991a68d6f76da19a047d4c8968e61 SHA-1: ec52b6ca6b68be1dfb1b4467d28f20dd4db45f26 SHA-256: 438f5cd8bfe9e9c734ee943404f2a03da37d0a21c92ac2bdf07aab2a05717758
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the compromised hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072556f6e637---kubuniber.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/66173791262.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/15805665971.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f97fe12f616991fbb1bc7a69e188cb9f/mijokebalilezasivafowizo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/81f6b270ed6b8a41166a5bed8cd8115f/17623129940.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa227700e64---30397065070.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c5a663eba271fa8b5abc0a3a5cfacb85/jotikisezoguzuxubad.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/kodebegodozononexusipekuf.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7fae5ccaa0606e7aece2427b414d0f87/tatozomomage.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dufamomavegenepodo.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/fezalupudo.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0300u3lh94n0dhummmj5iuku9i/xufabedubewuxo.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/rakewidalusitotatoboj.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16090613397320---nataxobufutifozez.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39f675e3b---linezeziwuwimomagowu.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/38414802649.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859ae66c760---99484598328.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/31322039862.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/be9c6ca93c171da816912fdcc1454ff8/rabavoto.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/goxip.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bc27d764---feguwenij.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20694f1fe5---tixenoxule.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/a56c7su90kubhegvqri4etotdd/degekuwonup.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160987f4fec5a8---1104109094.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f8fefb7f6c4d2ff6dbe36d22882b26cf/16936938287.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083bee7e454d---24388729881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fast+furious+2020+full+moviePDF 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_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 10656 bytes
SHA-256: 5eec85731ceaa093ce7c72050fbde9d17cec237c41f7b17196184cb2b33ea2f1
font_01_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 19556 bytes
SHA-256: 26ce1dcee91f6812b3351d55db380d02aa34e8d14ef0318e3a1ca9f653425d53
font_02_sfnt_off00014242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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