Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d042798a8f1fafa…

MALICIOUS

PDF

74.1 KB Created: 2021-08-11 08:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 023b911ca76dcadbba0c8e137f95ca59 SHA-1: e1c58ada22f30909d5a48ebfd56bcef6b89ac8ac SHA-256: 6d042798a8f1fafa9c87c102a5664e7f924c6b0a1ed7d1bc7a438de1c3fee146
164 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by numerous external links and a heuristic flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload or visiting a malicious site. The presence of a 'download button' heuristic further supports this phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=microbiology+laboratory+equipment+and+their+uses+pdf PDF link annotation
    • https://alteanetworks.fr/img/file/popimemomobu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/cinp39m732dmoo1kunog5egoig/pedajejo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05c43a504e---20080810487.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e447329b220---kadewewota.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/99333017568.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/mereda.pdfIn PDF document text
    • https://shopabrang.com/images/files/lurerowafotomajiw.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/amodf7r9ivajgkcnqijhktcf5l/54495501874.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/metutimij.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/zepurixerofim.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/tasikosevokimerasojizemu.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/615e79345abd4df2f6878a6a8c4c3868/rebivogumiruwajodibi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5cf5d70f650eab9de7d481795c49a74f/runikusavikegupu.pdfIn PDF document text
    • http://eibich.de/layout/bilder/file/tenenidopo.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tigiliparulu.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/1415082fbbd8813940e916161e52e554/32174097388.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/wasufevowezowo.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/77064355988.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803bcfa5dad---91118060032.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/situjasonovupuwegikinusa.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/34759376252.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/79749759713.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/dlu9esc1agrkkila9pt5q6jk31/falowosujidogupixubup.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/84496836298.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e89d56edab1b25bb0e7d3e2f53f32a14/tixezozepatok.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608641bd9c0ed---laxoxosutonawop.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb065fd4da3---menowavalebakitafidumuz.pdfIn PDF document text
    • 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_off0000bd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 16184 bytes
SHA-256: 735968720b9b0176149a37ce432716b5290ce14cfa6dc5f567c7646d66c15c32
font_02_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 11560 bytes
SHA-256: c8e15536d9c7a9f1b08f27f492478a5e4ca9ade7c994ef6ed437af564bdc3b46

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