Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91a4194b94ee687…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 16:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7ad0712ad0501d44f0ae65408ed9b32 SHA-1: c60e3b21e520a5f713c71e2ffc457875cdbb90a3 SHA-256: d91a4194b94ee68748b91c5c4db92e04531a285d09961a745105eb6465d0442e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. This pattern suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://banglatalkies.com/dynamic-images/cms/file/92312095842.pdf In PDF document text
    • http://atomleasing.ru/media/File/16683455459.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/lql3qqspugquo78ei36sur7vlk/70473698937.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/xanegozefatid.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d2fb13daf49ea654240f4d5a5c16671d/tedexusisosovabuk.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/52940275127.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160965e21aee37---lixer.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/98219027979.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/871690f047713380c6b0491715569c7c/68065054327.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/78083144783.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/k74u5hkqhtoa3ivrn1i50n9ng4/kajojo.pdfIn PDF document text
    • http://turnyras.lt/Files/file/81544676172.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/moe5c88b3bk0d6lh7sm50lqjgr/20735962912.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/rc4e1r36c6biikvgkj1klpdjt8/baxifo.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/223794aa5904c485430ac6d60efea7b4/nemavuriw.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/3400236134.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/pusebad.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/42592647652.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/79214977150.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/manedinoxurufoxis.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/96247129835.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/jajodupabif.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e28b1f37---24245697474.pdfIn PDF document text
    • http://yongqingtech.com/d/files/73168055329.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/narnncdrnu8585ljct6bmslv53/fulilesunum.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/futawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=call+me+by+your+name+book+online+free+pdfPDF 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_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 10872 bytes
SHA-256: da1add17356d73a91feed5ef978e87d270af78b5613f03a63cce576bf3da1f26
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 17312 bytes
SHA-256: ed515f5bbdde94be6b3fd618ae341b43c7530b313c8dbcd42bf9cf12991489aa

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