Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f546417b6d3b73…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 18:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fa91cf52c8007e1f1b5bff4838fe11f SHA-1: 4a36deb4737be91ffa8dde2b1f75bfe6e6560e1b SHA-256: b9f546417b6d3b7319f2e34fe893ebec992efaf8c8ee2a9c4c3860e4a5c079e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the ClamAV detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://safewatersolutions.in/ckfinder/userfiles/files/58564237952.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/77567623996.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/51ac70b978c01fae39c7d71ee00b1732/80794317108.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/viropibekixuwiselaxarog.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/97468187789.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/20626095971.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///nemalelezor.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/palizuvitawuxiwapuvad.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/tujokef.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd581f9c9b32733abd6cdd6949e1df1d/65420308827.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/87aaefe08650350e8a8cc722233afab5/jelizuxizinu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe4a45bd5---64374725286.pdfIn PDF document text
    • https://kermanrooz.com/img/files/tavazibir.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/90805871329.pdfIn PDF document text
    • http://marymo.ru/uploads/files/48179531841.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/vadetemoruguduwijomejup.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/36928538532.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/vidodurisozenibodusopibi.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/33174393314.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/36192050858.pdfIn PDF document text
    • https://sergiomauri.com/images/file/89921906545.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3749ff05---19983599196.pdfIn PDF document text
    • http://unityproductions.com/upload/files/lalumebofaworuzexex.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/rividamafugemativa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+screenshot+samsung+galaxy+s3PDF 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_off0000bf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6B 17124 bytes
SHA-256: 29d5c8fdac57c2b6432ce96ee97e4110c81b9dcbecef3f47ec2fd39253c231a0
font_01_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 11152 bytes
SHA-256: 22b2715084477ed8b2a63219a6131d8fcb26c776485e7124c2736cf2c9b0cd91