Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b589e2afe6d6cc…

MALICIOUS

PDF

78.0 KB Created: 2021-05-25 09:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 97e413c7c7c16e51fac669c1ed11b2ba SHA-1: 1c6b99e6ef8093c0c0d571fa5f8b00314078b795 SHA-256: 11b589e2afe6d6cc4d0d92e2f66ed26dea50a9c6e911aea7abc5ac0bcaaaa298
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25B2%25D0%25B7%25D0%25BB%25D0%25BE%25D0%25BC%25D0%25B0%25D0%25BD%25D0%25BD%25D1%258B%25D0%25B9+%25D0%25BA%25D0%25B8%25D1%2582%25D0%25B0%25D0%25B9%25D1%2581%25D0%25BA%25D0%25B8%25D0%25B9+%25D1%2588%25D0%25B0%25D0%25B4%25D0%25BE%25D1%2583+%25D1%2584%25D0%25B0%25D0%25B9%25D1%2582+2+1.9+16 PDF link annotation
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/cg4fijrimahsnkmkimu8o2f7rm/wagunolabemuju.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d369fd13---24414157659.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/431ffad61be8d7c162cd6934e169e698/80125329623.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df77812b85---vutewitur.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/40140515280.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160961cef8a1bc---19638893028.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1c7bd30b---48822930291.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/25932591864.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/50940860887.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/ditotoregutodoto.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606faede1d6e0---tilofoxojedowavasizefar.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/taxazoridutufikelasod.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/53044500964.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_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 6092 bytes
SHA-256: 6b585cc7be86f681927a69b29836c20e8d425e23782e2e5c176f4e18439a745f
font_01_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 14904 bytes
SHA-256: c7c64640e8dfee3c234845dab08282b6516d46a86f6b261dd9e99b7ff0291e19
font_02_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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