Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00b35c651510184…

MALICIOUS

PDF

72.2 KB Created: 2021-05-27 18:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 784f57dff2f61f7a8369566c82c3238f SHA-1: 39dff8f8f27218698ecf47b411583e062b3b08a1 SHA-256: f00b35c65151018408e20884f28511143bcdbada1fa282fa9b4ab7dcdd06aea5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://huntic.ru/uplcv?utm_term=movimiento+rectilineo+uniforme+retardado+ejercicios+resueltos PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a667e11f0b7---kaxegowewujumorekazakokan.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/87354310618.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e0ed0037---8473899688.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f081b4ba556e1d00002cccf4e1e39745/gejakubeveliripade.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f51d7c5c---35006027129.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/guzitoxabejasa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dffe0b3f0e---diwiromubaxodelatexar.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8fpomgkc3ej9o68d5o72d7osld/43524026308.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5da7b507125ab13de7542f390474d2ca/seditifukofesukuzo.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/gumenemirugewurebamopur.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607677ae3eeba---66052978326.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfebc1dd34---jiferegitojubaloleg.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210510172830.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557dca2e94---mevogodinoniniwexasijufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 5188 bytes
SHA-256: 9499233a975a65209adbde37741ed83c443ebf28866a3080f23cb1ff69ed3d01
font_01_sfnt_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 12324 bytes
SHA-256: 0b7ff568ee16970a601023ef5d3a7c93c3c983544290d2c59ae94373727dccf4
font_02_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2