Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2fec9f1d1e699c…

MALICIOUS

PDF

88.8 KB Created: 2021-09-14 11:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f94962133ae17e1c1894eca1946d2d1e SHA-1: 25ee0f45ddce7d92ae2ee294aea3bec7c22b8dc5 SHA-256: 8f2fec9f1d1e699c5a3c889c860306f8e3f8c89fc3824ea16ebff81ebdb2956e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, suggesting it's designed to distribute further malicious content or act as a link farm for SEO poisoning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://finadev-groupe.com/userfiles/file/porazatumi.pdf In PDF document text
    • http://bulmarconsult.com/files/powojuwejowazizulesara.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///40129913591.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e02b211e---kotudajuba.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/45384966949.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/vemunesepajelotok.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wetonagufiwagoza.pdfIn PDF document text
    • http://fullx.net/files/46240455230.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dnhji1v662vgd4km1g4qpa9d87/2477404120.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/27439464892.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/89741967461.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/wobimijatisejal.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/55680741834.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/48300034971.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/3030683225.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/netotuvepinumetowupe.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a4964271e2b3dd43a8aca13088771f56/torunenuwurowabadofe.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/814900312.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/87295541028.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/12890563772.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/47136686263.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/6236507145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+faith+works+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9d7c762eb---lapavoxupubuxonawozo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 10480 bytes
SHA-256: 173fe670b1a9f3bd9e6d287fdb14cc548490ed901335601511a6ce28ab947639
font_01_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 18172 bytes
SHA-256: adafe6ba20f9d96d255c86b8808ccff9a1eb069e9a366aa2c19ad572c5e20662