Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb98d6ce27dd820…

MALICIOUS

PDF

71.1 KB Created: 2021-10-03 23:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ba5bfa7fcb4b484d490c28fd01fa1bd SHA-1: ee1e8bf2ac8836ce473e27cc59c8ade55f4006ff SHA-256: eeb98d6ce27dd82093c30c6e748b0865183c4b3ebbbf99ef02375151319ec743
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://rocksoliddesigns.biz/userfiles/file/luzovikulenu.pdf In PDF document text
    • http://a-aqua.fr/ressource/site-image/files/40340536789.pdfIn PDF document text
    • http://fitviewer.biz/files/file/2745646925.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/4129643580.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/h5edlm82i57ps64fupiat3jjvs/9817504867.pdfIn PDF document text
    • http://cssh.es/img/file/10888787695.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/71329595668.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/83621091480.pdfIn PDF document text
    • http://digifast.cz/userfiles/demegifudizidekadukituko.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/momupofegof.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/82005933269.pdfIn PDF document text
    • https://proia.bg/userfiles/file/milafonedaxuxagifef.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/73770439681.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/sofamomixef.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/jegabesovepiwilimimuzasa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbdc39cddd---35730645214.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zofinasuvegikagalut.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/48695082990.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/84399205369.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/sevinuvogaterefifan.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/tudix.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3de6a68287798f7fcafa2810ce2b917c/gabefagujo.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/1677327206.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210919001155_bnV2YWpv.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/93792845667.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xesuwigumudanixuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=symbolic+interaction+definitionPDF 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_off0000b626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB626 10796 bytes
SHA-256: 9ec51af49ca53fe35df5265d6588104cb759de026b7eb278cd69af7acef588b6
font_01_sfnt_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 15432 bytes
SHA-256: 07948325689c1f25410d8b7c8fb8ef9ae9ab0a24565e36a5ffa36a2e0889d7c7
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1