Malicious PDF — malware analysis report

Static analysis result for SHA-256 475b41ae2edc0b63…

MALICIOUS

PDF

213.1 KB Created: 2021-06-24 02:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a3723893227f4069f5be66949f5f94b8 SHA-1: 0d4cc1cc17b07416a48a0a4fd3efe2486d0374e8 SHA-256: 475b41ae2edc0b63efce181f35a60c6440b37189777d5921b819db3a193c3002
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated by a tool. The presence of numerous URLs pointing to compromised WordPress installations and external sites indicates a phishing or malware distribution attempt. The primary attack pattern involves luring the user to download a malicious PDF via a compromised upload link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=william+gilbert+and+magnetism+ielts+reading PDF link annotation
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080aa7c5c1db---texepifezuxedigivujazuk.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59cc0d3f47---61057913431.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7fdb9bd5f---babigomadub.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/838a17dc55597f4dbaa1e43aec0563cd/lanedufominuwejila.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/32b2cbf64de053c0a2cdbbfffc2716b2/48902034195.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f56bbed2---pozezulokikat.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4686bcde0---49209328867.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf1aa8c4ea---pakifojagusipuwazokemuj.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/zagidiremojebuwa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ddiaag3d7nijrn26dfp06gld67/gutezifulosel.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5624f7ca16d7001f8d1484982eef8988/14599784197.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1ff6a6c8---21116059648.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/89616404999.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9353b283fa4e44ddd95ed8d2beb552f1/23696138259.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_off000309e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309E4 5300 bytes
SHA-256: f19ffcd7a1a87977c148583ec74ba2ab82201c67934e8c27ba70e2efe76a3eb7
font_01_sfnt_off00031bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BD9 12052 bytes
SHA-256: 1ada3306b7096f69032c3a6814eda39c9b6d8722698b7ad52e09fba9153e5202

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