Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d874e4c5c628e27…

MALICIOUS

PDF

101.9 KB Created: 2021-06-10 00:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1f010ffb3748d0f877a823bd908488bc SHA-1: f2f8f6877fcfdc86e1a133647d837b7cf3fdce00 SHA-256: 6d874e4c5c628e278480b5eaffe7d90161557bf0fe2f9dc796cc571b1a2206ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cructi.ru/uplcv?utm_term=bts+bon+voyage+season+1+episode+5+eng+sub PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rnegrpr6k2fvbjm8gkitkne0g1/gunopajugo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i3p8ecphn7le4mn2e0dgq4g6m4/56730445838.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bae81cdedfba9b3933d66918c4708343/25341200317.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/32dfe91e0d37ae1dfe85d891fdc4d7fa/bodinofezu.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/3311589230.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bc95eec17696038fe1440773ef60484a/71156844410.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704abda3cd0---vavajexa.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160833213e56a2---livaxofuma.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ec06b82fbf4c240d5e099ef2460dad2b/kekeroron.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b80040f2b0d---98775889794.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zabijufa.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db4d586f9---91857741722.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c0a7e67b---14040466448.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b0bbbe56f811dafcffec046804d0e067/zolegofa.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/lolatulokonoside.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/jltj1u12pi07hpjuakfu2e8i14/lukufujoverej.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 23932 bytes
SHA-256: ed1b521ee25753efeef6f64685335e45bf80747ab22c90edae556927e0803d2b
font_01_sfnt_off00013bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF2 5528 bytes
SHA-256: 7a1b87990827fff7d391a5f46b626f85abad67f9b3eb727ab8bd685f140f7424
font_02_sfnt_off00014ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF0 11004 bytes
SHA-256: 07418b25e7e3ef0d9adc909f21c65367952d59cb973f1072acc8461778a4a3e0
font_03_sfnt_off0001749f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1749F 16132 bytes
SHA-256: 1dc3e4c0df5ca4cee3a891f28fe896d6b16a951626fb4346f09e4ab97736c5fd

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