Malicious PDF — malware analysis report

Static analysis result for SHA-256 098efd5705bbc059…

MALICIOUS

PDF

73.0 KB Created: 2021-06-08 17:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3b45dcd3c692a54b1f86fffbb5b5a3e3 SHA-1: c1e8ef37798709b4eddd9488e9f19661e3721750 SHA-256: 098efd5705bbc059468a0dcb6709f71ab12a46f5f77c3782019bcc9dcb0fb658
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, disguised with a lure for 'Minecraft java edition free download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://smidgel.ru/uplcv?utm_term=minecraft+java+edition+free+download+for+android+2020 PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea9d8bcaf8---raponitugomasufidek.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2i1l2cms1shm6h28414m6ismtf/turum.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787ca7d1a5b---51478448163.pdfIn PDF document text
    • https://carlojans.com/cms/file/40270219197.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1d3c14b92949fe806148488f4f68aa68/nuroworurevoveruxokoge.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608996e356d88---radeludibaxuw.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/91174745878.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/84198403235.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/nijowug.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/mulufinejofadefeveve.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc5cb4ce8---zenulogovugipejizu.pdfIn PDF document text
    • http://ligneus.hu/upload/file/9468513884.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b08090834---gumojali.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607996a272720---15773394967.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cq1rv038nkuvvcihl1pmc9va9v/37486403049.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/51769e176580f0b473f07e9e0428a956/kutimokesoxivoj.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_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 5344 bytes
SHA-256: b0e608acb11065f0b2a73f2df34a6f7ecaa708d3ca7ba2cd05b176380b3ca1a9
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 10604 bytes
SHA-256: 6fe6fb90735a92e71f02b50b744d4b059ca9ecb0530cb9665aaad15113072607