Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e6e0366fbc010c…

MALICIOUS

PDF

236.2 KB Created: 2021-06-15 15:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4315d21e0b99870221f52182e26ea7dd SHA-1: 91566d7966169201a55ab5a53ba0322699166775 SHA-256: b4e6e0366fbc010c6d80cbff3e527d3c1790574c51cef045a6185ed51be54a8f
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://coretry.ru/uplcv?utm_term=download+film+attack+on+titan+1 PDF link annotation
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1583a21e9---84558034522.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/61792353825.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mutidikobaxiz.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9ae6edc7ed8682f1a8cb34479315fd51/moketi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0qbgj876957uecbrr0s0jl6u00/59328982051.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2fc6b8388377bb976d3f31c145616729/88586680133.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087950a829b1---jagudukidipufezajesomutaw.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zitobidutadovewerebagu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cc37f95040171bcf8326367b5571ab52/64799638756.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/sogugigulap.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae3fea836.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83994992aa---264248958.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bbb6d6550fbe531910e8e6e78d68a279/gedubamefamedezu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14568b677---98674449518.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9e5cf662c3b816d9afee135f579a8892/10915807027.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26FA7 81268 bytes
SHA-256: 21ba05e2ccaa53b796d87d7e430962892b26f95eeebac74a852c3da2e3386dee
font_01_sfnt_off000363b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x363B8 5100 bytes
SHA-256: 151b13a0f89f7979e97f7267c990cb99daa1a7e051378bf1a7dfc83d464fdbf2
font_02_sfnt_off0003752a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3752A 15408 bytes
SHA-256: 1f3343878f49e73779bcb6ff6a712e51ac3da9c391b14b0bc1815938a17cd3f5

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