Malicious PDF — malware analysis report

Static analysis result for SHA-256 16172542781a9103…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 06:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51c11955d9cbccf8f960cbfb718a292e SHA-1: 7e6fe2d5d7c2e40d67f1aa0a1008d21038ae7566 SHA-256: 16172542781a910382845b3f7e9de6b5c1ef2853c5c7b686b0295cd2146cf55e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains. Heuristics indicate this is a link farm, potentially for SEO manipulation or to distribute further malware. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828acba20a4---wimulusa.pdf In PDF document text
    • http://elencostruzioni.it/userfiles/files/nelasuvupilub.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/61617455017.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/79024273670.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9b1d2510---8037962635.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/515058252.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b79d0e10f---gulabuz.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/sabeg.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/nujolosiwugofiroxi.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/11635999875.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/porugozegurasek.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102daca144c1---83031723487.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/guxukilajawuginasesemolo.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/giginegevaro.pdfIn PDF document text
    • http://otczenacts.com/media/files/zadefuvuwinipefapotumud.pdfIn PDF document text
    • http://naso10.com/userData/board/file/gideg.pdfIn PDF document text
    • http://nktrading.qa/file/files/53072880695.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8e8e90b4991f8d0a34f42850b9837b15/peresokofelojujeneji.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a67594a5211---pirason.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/ziwoj.pdfIn PDF document text
    • https://loctra.net/userfiles/file/13103627098.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/73691943794.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/megugamifalom.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/29431821284.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4100b7cb97---tekamozol.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fal40o6m020msdu6qboautcnj6/fevupenalokibefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+difference+between+4+cycle+and+2+cyclePDF 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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 17408 bytes
SHA-256: 83f6d95cad0b1fc90ec379fc26dbccb89a1a47b3d652c843c1b246ec9f756330
font_01_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 10984 bytes
SHA-256: 0df088dfacee74491ad323fcd01967015ae8568357e70a2d385e570ac5be6b44
font_02_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.