Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ad51caadd17f1e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 16:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b17486f4146eb068d5037927f017ae70 SHA-1: 9d3c010d6d8603c93ca3cfa7022b150112a16262 SHA-256: 90ad51caadd17f1e74426b80f107d019681bf16a428a21e68fdac3414215aecd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure as a link farm suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=austria+hungary+and+ottoman+empire PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749298e4839---24643910328.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/k862snagu2gpkumlmedls9d8c7/67909862082.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/fabezemaluxekegumiwo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a2056d944---seketoneniz.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/93419336481.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/podizesojozilesug.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/sibirofexusaba.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1a94fcc2---37126431840.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32ce373b95---vevupi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629b83d701---55623334153.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/vefoza.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/72508345269.pdfIn PDF document text
    • https://kham.vn/userfiles/file/45776525369.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n1ftmb2tgbso6b415hadclol4j/pepowi.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/vugujixir.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/20553605197.pdfIn PDF document text
    • https://peterdegendt.be/file/84386320997.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6fe92653777c37490ee90b7f16e2f5bf/tobuxukazijibos.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/16499753710.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/devagafijedaw.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/koxuzasanikabafexarenubof.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/xawuvolazajo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef0988175---70653533248.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_off0000b695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 16988 bytes
SHA-256: e38c99333b0e2fc072baa3dc40d751c612ad767b2dc550e17e1e94e64eb691b9
font_02_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 10988 bytes
SHA-256: 5c9a2db108c4de1a0fad9329c9dd7e21c325f58b685f3a635c88881d3fe92481

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