Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d6c331dbf74308…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 19:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cb1c11cebfc9164b8bd6e413ff0b5b8 SHA-1: 260c23629079d4306dc529e4e6b92063018a39e6 SHA-256: c0d6c331dbf74308487bd8c16823c91654cda85dbfdeaecf5cda300b222f654a
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO manipulation or tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://kstarsmall.net/userfiles/file///kibijusefosuzetemovuget.pdf In PDF document text
    • http://aylincinarli.com/fckfiles/file/zoruxetus.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/36925250799.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d372f954---nazukelexir.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vabutivaluda.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/39094758037.pdfIn PDF document text
    • http://laduses.nl/image/file/44520315266.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/97613884779.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/23676744900.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf25992957---rowagutuminaselowosapame.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hmau128elfj4be2d06pkb9t8v4/13611425539.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/88120553147.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/73167480775.pdfIn PDF document text
    • http://dhf-china.com/d/files/fokijuzubuwodu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/gobul.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f53196deea12f90ea58e0b2e23a3d7ec/tokikemanojipisuvuta.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d6e6320b---xoluwedejagelikadar.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/4g42sv38ief431r3lgqop32835/gutedojuvijow.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/11046703717.pdfIn PDF document text
    • http://ledins.lv/cms/file/sigefibifokiruzekusemafo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/furazorutidukurodapexoko.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/b60gsem17n1sdnr46fr1t8gu86/lajoti.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6049a9826---42204733295.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/37858892166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mano+computer+system+architecture+3rd+edition+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118dac225813---figilowosikezodotopum.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://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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 11220 bytes
SHA-256: 3dd479bae2bf793f8c3ea7dd0f129e38239495035b6184165f16112acba52df2
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 17696 bytes
SHA-256: a539cdd234072e15c6454c3b95f709611c647e2cdd724606cc68c2d60169cc6a

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