Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8704f1fcc22061…

MALICIOUS

PDF

106.3 KB Created: 2021-07-08 00:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4a6e78ef72a1812aa8fe14763bb0bf6 SHA-1: 036d897639fbabf7e7fca9e9be45ab5517813bdd SHA-256: 9e8704f1fcc220612faa922cc4a1d56bceefab78fea8d18b24d025e2e6f6b6dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and external URIs, with a high ML score and ClamAV detection indicating malicious intent. The numerous URLs extracted, many pointing to compromised CMS upload directories, suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the heuristics and the verdict strongly indicate the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://ketchas.ru/uplcv?utm_term=the+conjuring+3+full+movie+greek+subs PDF link annotation
    • http://mtsskzy.com/userfiles/file/66889261443.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbc736a8d---nifefuf.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/21185636753.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/93bb2a481a1b7f7e5f0bee12ab491ac1/jolukugukager.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4db0397b866424657081fcfd7023ea3c/19802550321.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4fsd0dh72bg38o0nu5j5v9auq6/16157726985.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089e37d0a74a---vepavakarusivuvanibomiwas.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/logozovap.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/zetujidupe.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/zemaj.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ad49540d82b---93254665321.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160875f77cbf77---2094041219.pdfIn PDF document text
    • http://www.toptehnik.si/images/88723397632.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/47t2aaa2pn5q7nhmevhs7i36c4/99426086229.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/noderepanozotugajoko.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/gujenoxuxizirexisiju.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/81145127527.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foxujikotogumilizamomirop.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/57b9810df41b8d3ff4290fe33873bed6/50339921402.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/bapipazikadedorasiz.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74c54fe82---wajeteluxali.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073412770c58---lapusedizetuso.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088582092be8---tukudusa.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017339.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17339 17960 bytes
SHA-256: 52acac7be7da9e9654129c6cb5d02be298248702114fe0ea1bf7dfd891aae096
font_00_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 11184 bytes
SHA-256: edb18c0413e2aa20ba9cedc3f91ba58cba22dda1fcea47c17944e026b03e2fad
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 33332 bytes
SHA-256: 8b5815866972368691fe1629ed739682375037da0f9561768d7c0e62ef3336b8
font_04_sfnt_off00018f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F30 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e

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