Malicious PDF — malware analysis report

Static analysis result for SHA-256 06414d8624484a5d…

MALICIOUS

PDF

70.6 KB Created: 2021-06-18 20:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bc80233e9fe0bece858ebdf206508db7 SHA-1: 1f9f3fecc58c10210736843074ae88be09fa194b SHA-256: 06414d8624484a5de1324c61262df8a3176b780d8367b4f3d29641e8cfcd1ce4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to 'vocabulary workshop'. Numerous external URLs are present, many hosted on compromised WordPress sites, indicating a likely phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful 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://drafthe.ru/uplcv?utm_term=vocabulary+workshop+level+f+unit+5+vocabulary+in+context PDF link annotation
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/j34r1pm0j2kuspmo3rdqdtk46p/julajevozen.pdfIn PDF document text
    • http://cloverdiamond.com/file/55239863209.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d46ee0a2c7bc26da3a7a952f21634d63/91251426702.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6864d0ec1---13520853539.pdfIn PDF document text
    • https://yorapp.it/file/13047188074.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6db70dd6b4---45515988219.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/25470435274.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/2762651950.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3c1feb03716cf5888220187c5e63239f/kigexof.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/0ohiomv2b46s65lf6ds0f2igfd/leviwepumumumezojubo.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/dabodenapajukeras.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/73c1b0fc9bf673232b840fd436c53e9e/votuloxofusufitoso.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/20eb4e2be78934e7293cff755eea7cc3/66711756966.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4f40b21f---13658812563.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160716cc69031c---29300523301.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/93830948074.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_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 5716 bytes
SHA-256: 42aad46b86f66fc8e83124ce76509946998ed6c85b1b3976f380365ba53faf80
font_01_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 10848 bytes
SHA-256: 261ecfed0a948a66750096a7639d1dd6510fd2494d8b3800880bf2783cb931ff