Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ebf289536a7994…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 16:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe6d8c26c3548bf861f33f7dc7aa5371 SHA-1: 7a9ac565e65cf025f2bd0923886b66703841e86b SHA-256: 94ebf289536a7994201ae53dbcf5faef7600aa21ccd9cbb181b7b8d4a715cd8e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=jnv+application+form+pdf PDF link annotation
    • https://advik.net/userfiles/file/33724801986.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/888624fde69a87df3a808dfd21b7e71b/senuzojadewapapala.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/36293048309.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/32323305285.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/kurajumafimuzawodixiroxit.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/80923624151.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/funepixolusaremegimapani.pdfIn PDF document text
    • http://identik.hu/editor_up/40095713302.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3239d1821d1533023fdea2b42d23c7a8/bagemegugarinepelitop.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/wuzizejiwixiw.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/jirunowira.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160967e6452639---77056231390.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bf024e3220d---ramitinivalaxizobiveroda.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/minugiv.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/59cb8l8g1nvev0n2v5aek2kei0/finisa.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d0f77ea56cd9738d789e5f7f8514132e/pifinonako.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gccgvjfkphccr672q7pvrfofvq/41206994631.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/ziganavib.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/ratixaxuse.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3da6323f1---sanebuvefadedo.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/siloz.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C4 16132 bytes
SHA-256: 5d639b6c56c08b804bd2321c7bd11925c0f514119d6f0831b99510f75080561c
font_01_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 10540 bytes
SHA-256: 4b4fecfbda40ba5b4e9adeff0365dd4252e625c0fb2ee6340092d8f27ec415be
font_02_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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