Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d86563d1b84fdce…

MALICIOUS

PDF

65.4 KB Created: 2021-09-03 18:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 884e6cb36d0eab019e6b5461fb3c2148 SHA-1: cc9383e11664baf022e60f1e123c826effb8899b SHA-256: 7d86563d1b84fdce14d9892f3a2d14992c4e6be26011dcbe4dc0df9b880333a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=researching+information+systems+and+computing+oates+pdf PDF link annotation
    • http://poiskvod.ru/images/file/tonuseleroxomebikaxalinur.pdfIn PDF document text
    • http://msiutilities.biz/documents/vesiriwotisagopi.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/vomis.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/zubezekafaludusefatirap.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/44629917984.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/16759503412.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/78831697180.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/82521174277.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/68881918882.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3db06bdc2---11191547047.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/96643102493.pdfIn PDF document text
    • https://mmszke.hu/files/file/76468979720.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609acea203956---63981016160.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/2620370846.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/usiken00lj6n749r2pcahujo7s/nabapala.pdfIn PDF document text
    • http://indel.sk/userfiles/file/64678414113.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210704_7B3FC73E6882AA46.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f752138c48---43146743638.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/04f6c7a848e29af1e2b2d977484ee9f8/dizugukojelot.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/56c5963000024cdd53fa0af68c4a906c/kuzuxagulex.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/bevenebabimamibi.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/33218244713.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/fogutake.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a450593817---nibobadobekapobasazozofoz.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 15648 bytes
SHA-256: b962c88678adab311a22fea38e83fb3050185dce2f40f9e8725bc2ecc4520e48
font_01_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 11280 bytes
SHA-256: 93962db980e195fd4448950e778db12e8ef064bd9db83063387fca06d5c53a5a

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