Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b79957abb5eec0c…

MALICIOUS

PDF

99.0 KB Created: 2021-07-16 22:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9e159273fa5fb6a3d4c94ea60e6509c SHA-1: 5afc3f89129f212cf596f5220b1c9ad406cd4314 SHA-256: 7b79957abb5eec0cc319ee651860f1a771b0ef0adf97f9947dd3ba2c1119c013
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, directing users to numerous URLs, many of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5rppn9rvgso2dlggu8skdtvnt7/86134944101.pdf In PDF document text
    • http://rymwid-training.com/userfiles/file/jinixolapasokaniso.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/vusonasitonid.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/neketekoboso.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/sojewa.pdfIn PDF document text
    • https://artbynela.com/uploads/file/78747274847.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/707f7be287580b1e82ffe5944d27e272/92117410663.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd4026a79---92568038399.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/36b813079317758c0f3581371627bc2e/96360938754.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9251fc57f9f2d51f7b6d986e8c896cf4/14442156479.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/roboxazapodivelitikubezuw.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5uedu39shnn77bo10n3v39j8vl/10143949603.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160af86a64ed11---77771197962.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/64861487676.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f7a03e4f---19065336683.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c5075f33495---vufara.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e1a97600---66228062264.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/pvo3o4c9hlieg0s2ehseo9qsn1/fipukotapulakeja.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160986674db2cb---31698917579.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a129e3a26547d9fd24c76f4bbce1152c/peguz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd154d5b0e---jiravudojipirakom.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d17b1e47878bc15ba53375fd778c798d/lomevuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=caracat+for+salePDF 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_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE2 17424 bytes
SHA-256: 87079f609b054142233b62860bd83e5a05456e5faf5714224a38a0b3e199b6c2
font_02_sfnt_off00016833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16833 10164 bytes
SHA-256: 9b7e44177322d5bc46fad20e2f6c10a5ff97315c4c42c21600bfcdcd85f722da

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