Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ed59876b08f461…

MALICIOUS

PDF

72.4 KB Created: 2021-08-28 06:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ecbfeb0b5fe5fbc20b183c464d971a6 SHA-1: 98f6e5a92bb684be6200ce7eb778d68e01bc3809 SHA-256: f7ed59876b08f4618febd0243a8bba73b34b711874d28e927884fd80c12e8724
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF's structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.crpm.ch/ck/ckfinder/userfiles/files/99677526762.pdf In PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/suzuzoda.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256810843c---vutopanokovetojaxemaxaw.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/de0b772237ac81f0ad154ac3e4e7cad1/zapobavejaminadofumizi.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/logotasi.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/makosisunate.pdfIn PDF document text
    • https://landbar.com/upload/files/toguwi.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/fujek.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108261318077783.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/20347872273.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5a29d3fba65974071185397f4c919c69/85439261574.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/61031109641.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/rotubebipuwerax.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794877242b6---tuvoku.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535a424cc1---dasujikiditokub.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85342c5c6---kitisetirimilodov.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/43060186100.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/jimozebub.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/gomededu.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/35u8apr5p6fbrmb4kvu72tgc21/rokamoluwe.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d91f8096d---73742839945.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607665a02e3d4---8427643978.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/27943532253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=humoral+and+cellular+immunityPDF link annotation
    • 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_off0000ba70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA70 16332 bytes
SHA-256: 008bcf49df6442707424d42f45f09aaf091f8d8bcd00a92805e7a80855f2fdbc
font_01_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 10568 bytes
SHA-256: c7956a02d6c496afd254b188791aa3b09c03784c198a6d65525a9cff62f57c86
font_02_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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