Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca0f9236a85af03…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 00:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 903ddf59a20674a45b21f434394db579 SHA-1: 81df07ac6e833d31dc3031a67b88751d8aeb0d0d SHA-256: 5ca0f9236a85af03e9721e794bcb524a46bfbdfccf8036d74a0ba6394e943a5d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to other PDF documents hosted on various websites. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bhhangkhong.com/upload/images/files/88365484282.pdf In PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/xeguxuvikulut.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/32024278755.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/poriwam.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/97602772836.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/zelewinivukido.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158cd23b750f---debaruzisupudalebag.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/28ecc6770f1e964230cba2fbfa0265fc/43041062747.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/gomojepabig.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0ecc17822---85112470024.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/58968696989.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/gufigawimodozetolen.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/68693343497.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/6809798092.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e428b7617f1e33bae033a8a5784b81ce/36255259021.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/29851682488.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/25901313961.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/koxabanepasebezegobimu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jslda88p6mf9vpesgjg4gkbfmd/lupuvar.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/fojev.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c348b98ee3aee4ef5f4b2e3682078cc0/nunebifi.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/ponovegetutefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nursing+interventions+for+iron+deficiency+anemiaPDF 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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 11028 bytes
SHA-256: c6c84c45039514357d5160f7bee63be1413a3376e6efb5425f96815a253ac104
font_01_sfnt_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 14592 bytes
SHA-256: 24ed841f3a4cfcea0dd0ee28d596caa2fb530774b90ffcdda6c4879a8bdbbee2
font_02_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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