Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d14c3413fbec315…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 19:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a41e6a8889d59deb81a47a167c6dda38 SHA-1: 3d9af28770d45f234f27a8ebb8108b82a738345b SHA-256: 9d14c3413fbec3153c50b17507a47c995e1828d08d0c657720134526773612a6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to PDF files hosted on various domains. Heuristics indicate these are likely compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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://garmaclima.com/uploads/ckfinder/files/57025504257.pdf In PDF document text
    • http://pro-customer.de/userfiles/file/6704275792.pdfIn PDF document text
    • http://hingliltd.com/userfiles/33141053385.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/8049015460.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/bawibekosafin.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/derakexexofodoki.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/93183157653.pdfIn PDF document text
    • https://e-room.co/userfiles/file/81852843237.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/lurevof.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61e3e223f---gatifid.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/73hidtb5j326g0ce7gh1dqc8id/96534143829.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zesedizorizejurexob.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/pofalinujemag.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/13064562400.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/xitusujeso.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/tevobejomajizexupunezogof.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/fikexosezisepir.pdfIn PDF document text
    • http://belniig.by/public/file/zaxedotejaborupetowej.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/33689020733.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210901_84D3739D8C6997FB.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4dc593ff---muvoxizuxukidinowewa.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d32adfd1---vonufapifatiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=final+fantasy+tactics+openingPDF 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_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 17652 bytes
SHA-256: 8d3799497515a9da69a508dfebac4f1c39100d5c6f9ae6e33fee7e7337713328
font_01_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 10648 bytes
SHA-256: a259aa3df75248f77ff673076c1642e1fc3e397df36f714ec641feca9e2da457