Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cedebd296a52629…

MALICIOUS

PDF

82.4 KB Created: 2021-07-25 12:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b2d9d03499d7429c9717070592dc667 SHA-1: 003e0b1300f50a2d25f8bb28ad9fe2cc64773b84 SHA-256: 1cedebd296a526297e2936760ad973bb68c8bbf0fc0db47a3ba5b94b25d698a3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to direct users to potentially harmful content. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://fcv-bo.org/data/fcv-bo/userfiles/file/pamagale.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/093a21o3dc67rruifl5mohcf64/kikoxevisumodefusana.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b085809c323---82698537157.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/bolomulibas.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/zudapimuf.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/siq6p0edb36dnfk10abaea2hq7/64347253386.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/setixamewerefe.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/66857646695.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7368e42a7ac3d223c8843296f270ac40/vawewilokoxi.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/2f8e679f6dcb69e20cfb05c5799987fb/dosipawinejojanopevovota.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/79310655621.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/aa8ea127f62018b33b8730a3cae4ffb2/50675464856.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083de56d96a5---97433740441.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/newesi.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xojosilojezatusidap.pdfIn PDF document text
    • http://cocoal.com/uploads/file/tukafibesebeliwijus.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a638d8fc---juduramumarogobu.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/305795089.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zufibolivivibiruluvafejud.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c092f098370---mebaxapugelexurelifus.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d171e2d1---78604828730.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a662955a3aa0cb36d79362b0830b59cb/68928219843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=daily+geography+6th+grade+week+23+answer+keyPDF 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_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 16892 bytes
SHA-256: 3c02b74bafe067a542844984f0c57400540b749aab1c0d0f8f29c8d180315a1d
font_01_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 11424 bytes
SHA-256: e8b74225233f22f25dc7c8b41c67edd453d6ad6e978b3b4ddbf665b3c38df7b8