Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5e1adfd5ef34c5…

MALICIOUS

PDF

71.4 KB Created: 2021-09-23 19:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6c08c4604d8a8b2083ad76c2e013269 SHA-1: 4850506e32a0e912c5f7832bba4c07edb8c85ab4 SHA-256: 2a5e1adfd5ef34c5ff5c3caaa31c9adc1e090b4567a1d3bc8f0aca18b7f5ee86
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8596

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.
  • 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
  • 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 https://queure.ru/uplcv?utm_term=finalist+of+indian+idol+season+11 PDF link annotation
    • http://baobianhkhang.com/upload/files/dixokopesap.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7874ea17---56977584358.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/jovobukavoxememetaseraka.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jixuwato.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/gidemada.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/614480515.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/qsd28t9d9098glj7p0pnpcd5lh/xutuwanuxaxebu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425db1b3ba5---vuvefoxamogevulijevada.pdfIn PDF document text
    • http://spiregene.com/image/files/20210916_101118.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/77742149410.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/29189596229.pdfIn PDF document text
    • http://lscapital.it/images/file/gosimivopabe.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/28666915305.pdfIn PDF document text
    • https://successalpha.team/upload/files/dupukilegakogili.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce6006874---79467718478.pdfIn PDF document text
    • http://hopkim.vn/upload/files/miwiv.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/20207099524.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/banuwivirojomowamaneti.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/bd496770971f7bcf6ee05852b4bae241/91537791105.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210920070351_agyf94.pdfIn PDF document text
    • http://15881588.com/ckupload/files/mifoteruzazotatowafunujo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8471d11726d999b171e2bd55c9a56460/54631361867.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/papegidadexezasa.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/81163410402.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/tewetufuzomubebuzukolifa.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/87541777014.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 10276 bytes
SHA-256: d092c0953ec18e23df1b5d8206dea19f0da5d5ba2be8028efd7677fd4d5c3e01
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1