Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d7fe5c5307dccd…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 22:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39b6a35f5585e4a24ad58d420018c05c SHA-1: 896e8385157c7cc469580ac3a81931e8ad4f889b SHA-256: d3d7fe5c5307dccd955a2555a2917e0d4620f144e0cf2837eb7e1c95e8d8a03a
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which are compromised or disposable. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious URLs, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://taeguektour.com/FileData/ckfinder/files/20210617_2615C15220DAAD16.pdf In PDF document text
    • http://agendaalzheimer.org/files/galeria/files/89707152258.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/af4a9f58d915de3886ccfc38646060af/7128300560.pdfIn PDF document text
    • http://biomisszio.hu/tmp/18588326744.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7c107d17eaa0717d19dc701dd7c1df1/petifopijojewepiwajem.pdfIn PDF document text
    • https://digireg.sk/upload/64172820396.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/zexafojesiguz.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94228566179.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b24d1df89999592fc73b358dd2ebb64/merijinakuvofunogepeg.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa8766054---wekevebosifelubikiga.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/5475390669.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/niwaxiji.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f684f5db06---gusipafidoxeluwakudubo.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/60842153675.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/52591299625.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075289de8f35---zesimufimuxuwipapaxe.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/23553445172.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d521e2a7fca2f6e816ffacac9642a25b/2427482167.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vtneka85na2883n0oboeaskukd/44141223911.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/vufavuzejobabafiw.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jdkb1528hva8tcopa24944aiq2/39083385788.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cb3c04275---41864486268.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63dd606ec7---1571076852.pdfIn PDF document text
    • http://vitrine-prof.com/files/xupesakubopakimore.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210808010649.pdfIn PDF document text
    • http://canadanur.com/resimler/files/donamosokokidaz.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/kimekusuxetike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=applied+microeconomics+book+pdfPDF 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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 18176 bytes
SHA-256: efb34ec99d00542b02fffe565c9b0b6056552b6f5807452a448d4ff22cbdfc4b
font_01_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 10732 bytes
SHA-256: 2358b3cf9b8b2a28392ee2e6aea99203c8be3400ef233019307e70804b959827