Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c9099e67a63f42…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 21:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 199ab323957c7ed2e5d6c62865d85bef SHA-1: 3b50d867955589d9a0722b754db4ce3b59d313f6 SHA-256: 57c9099e67a63f4272d8211a44672199b777191d6b49a049892ed31e8fc2ab2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://smidgel.ru/uplcv?utm_term=research+questions+pdf PDF link annotation
    • http://pressvaluation.net/userfiles/file/23596460993.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/vitixisugolisog.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c5ae1b8d7---37354127173.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5699c0dc---80989424623.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/mewawokagitexe.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8460bb12a838ecfcc7371c203b158721/nugerofopilebovatuseravoj.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/17203310494.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/2bc500b2d32f9654e38bcfbb713d80f2/96444571719.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/44742659220.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/fazawuninagamazevow.pdfIn PDF document text
    • https://sinarwaja.com/account/files/jujoselukewowapurenofuk.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/4mkrju7dcdj1imgm2relca0ntm/fumidoveduka.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/funoxokazuz.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a21ecbe72dd5ecbc1cc19f55413a8feb/fonibovaf.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5293484de99df784f9aa174a5593c879/rofun.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/23514883860.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210717_DF744279D8EF6F19.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a5255531650---gikomusivubedasosone.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/gabezalawubuv.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/86193641496.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jivosesivufaro.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b83b3250f---wepegazijejok.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/730ed5f2cbde5a2d11dfbb80b734b8e4/rolugotemuganezo.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kavaxonigevononozadibaju.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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10964 bytes
SHA-256: e408b2469e33bd68a5e1b821ca5d949536374fe24d5cb0e5721087184fd18a2d
font_02_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 16916 bytes
SHA-256: 5ed1c0caf178509ac22909e7b3fdca85a0e0ec1a0a1773f3eef4cab244fa1d2b

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