Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d3190f5d9d0775…

MALICIOUS

PDF

72.7 KB Created: 2021-09-01 09:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6eec762e7f926b1ffd526b9e44262b25 SHA-1: 31a1171f6f2f3189a3d47a985da5cadfc2f5754c SHA-256: c5d3190f5d9d0775b1f7ba11ae852998a77383e23f84eec60b6d33bdc6a9f52b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://archism.ru/uplcv?utm_term=database+query+pdf PDF link annotation
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c76b5a52045---wodiwirefiwopar.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6271036d9afde81f49386603b450b3c3/funopuva.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/fodoboraduzujivon.pdfIn PDF document text
    • http://usmleworkout.com/files/file/31426092548.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/lilanozedolaxot.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gisb34j8vmnb6c5mb6d44fdod9/67376319718.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/lerotorupuniwubagipamoj.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959aa040370---73725309692.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/49053241652.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa3342a262---bexiwovoviwi.pdfIn PDF document text
    • https://digireg.se/upload/81171184729.pdfIn PDF document text
    • http://packamate.com/userfiles/radagiruzudeboxo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef69a6ecda---nuluva.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/xosukefeliletinixagazakoj.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/betezen.pdfIn PDF document text
    • https://vestol.bg/files/file/xefexav.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/42230850250.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zojedutosirakivodefo.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/64102412590.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/bexowojaxaso.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/tozuzagixutafisisomebepa.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161294b6abea6a---jufifuvodalakolagesupa.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/82be9a7834a96dac56e1c55c1e4d4cf3/geresewobe.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c28d92d52---sunuzosubuviz.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_off0000bbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCA 10628 bytes
SHA-256: d2c10d5fa72ba955c62a0c10c8f8fe970cdad742e20458149c72965cae787dd6
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 15852 bytes
SHA-256: 68fb857433ca55d097b6a4df9f81b8c8ca1b80c58a3a7f3ddb7b3188ec8d3aa0
font_02_sfnt_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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