Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d51c294b571b37…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 20:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ae351b49b1617d58e9ddea5379d4dce SHA-1: 8af9cd69bf97faa1dc9483d64b383a263c14d1a5 SHA-256: f4d51c294b571b37f0766b382bb74e6de390179bb7682f219df5faf786da09e0
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 multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous external URIs and the 'link farm' heuristic suggest an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0a6e0664a66309070f022a36b6cca0d7/89000838537.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1spm9vq920nnnl83tk3rsadbhk/sevanokoboxemuwelumital.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/sodinomu.pdfIn PDF document text
    • http://abwrva.com/uploads/files/52536953122.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/29f430f7939f884df5d5f7c018f39543/47818529019.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b739ce092c6---bedirad.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/15889496864.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/damuvokubewev.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/jewewijogaf.pdfIn PDF document text
    • http://cy2hand.com/userfiles/nojoxuwexoritunume.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jumobokefinef.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/vixarufuxilapep.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2aa128d97---54725254717.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e3345c10f---35222331824.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d732bfa7fa1---dinaxomuto.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/60317802688.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01b5efab5---31246685245.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-22/20210722040324632952.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tewulizilasikubijigeji.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45133c82f---vijivamuk.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/bewivano.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/73109604505.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/cb73655950981adbba6583c60befe426/zogodutawudogenaruzu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/01f0da2c6e0fba7305296a0ff4ebe7db/wumudugis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=acc+hypertension+guidelines+2019+pdfPDF 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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 11392 bytes
SHA-256: 27c35ca4d48c8f30d9b442c0c75832bee6ec71ca74ad4695008c5231e17a3a70
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 17876 bytes
SHA-256: 5dee40ea48052c2d131a18278272fbfa4018b94490f0e8df30b65d6bf006f326
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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