Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cf67c027760de5…

MALICIOUS

PDF

97.2 KB Created: 2021-09-23 04:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22083713cf23785b3becc0e714a8d44d SHA-1: c03aa710d5c8d8a7c4184a72512d2644cbd3f261 SHA-256: e2cf67c027760de5cd6bac7432cfa1129206f897fd43ae3778059fdac6c224bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple external URIs, including links to compromised WordPress uploads and disposable hosting, indicates a link farm designed to obscure the final destination, likely a phishing page or malware download server. The embedded JavaScript is likely responsible for initiating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jenistudio.com/upload/FCK/file/zimasexekofaf.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8777505096d8db425404f0e60177aff8/3015064692.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210921185319.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/70463372963.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/wiwotejikix.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/pisoja.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/54031946869.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/5062811866.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210911063314.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/lojekikumikij.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/29494840916.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/17870429441.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/dugeralorigobisud.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/motixag.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc40f827cc---91309492903.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/xasetadi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3jdfianmhq25flrfi4olqh40jv/1500695750.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355e21af5f5---54437237003.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/xevebiridewupabin.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/9379569026.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/77225270714.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/dabuvizowexelojok.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/34265024840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=java+read+json+file+from+urlPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140efa3a2c3a---xuzukazi.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_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 19688 bytes
SHA-256: ffc51711d9576a288bb0914943cfbe7073516e5d01e02e133185b9f0f22d431c
font_01_sfnt_off000146e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E2 10704 bytes
SHA-256: 695cbc7d91122406f4084f2fef47e42fe837933fc9875cf97a189f8daa9238ee
font_02_sfnt_off00015f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1