Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb084e4cc0456c8c…

MALICIOUS

PDF

68.9 KB Created: 2021-06-10 19:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cc289bb6c4299917d1b136ff6d196f32 SHA-1: dd89fcd156f924be9b235a9e98356db7ccee58cf SHA-256: eb084e4cc0456c8cb057d48d09cf52fe508e71d44348c1c2b5567f7a6fb909ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=genealogical+tree+greek+gods PDF link annotation
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ml3ddtg2nfsecibpqdtk0n00qr/10341821139.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/wekorirojema.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/grr3hq0o5qki1rklvfj165kvq3/zugikezenibu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/dd932ded5a6e1e57ab0f03d2dc7f1d2b/koxetototazumupokaki.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zojabeka.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3ab9d95ra639h4650enp5isut4/tomuji.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a059088d416---14879010401.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/67155093610.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba726ded51---76818735347.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/pudinuvoxep.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/berelalowulosivip.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/9c52e1eacd55514694af272ac2dd5d44/4679733198.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/20886852773.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce3579500f---zuruxelufavamezikanufo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2fb2f2a2cabce6b8b2ed72e339922bad/60291675034.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5a3d5ae10730fe69a8b3018f9cc04ea0/95824184283.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3c31911bf5ddfafe74e37f73944e8af4/kafevisorepux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 5204 bytes
SHA-256: 270cc2b0f41b18661e2e6299dbbca35e121b751a478a9ceb92faacfc6ccbe226
font_01_sfnt_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 11100 bytes
SHA-256: 212b10dd12da5fd84c875b1164ef55efbae0931f47874039f362ad62a9ad99f9