Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d4d4634b04ed09…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 06:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a66d8b41bc3d3c58b04ae2c9b8c573f SHA-1: 8b44e340c9bf506ca6fb752dc8af0843eb90b07e SHA-256: 91d4d4634b04ed09ed2d181f40b8adaf3a75792ed9f74f4ab9d9b5f5ad3ef9c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.farmaciabergua.com/userfiles/files/muzemobepametizukowep.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaac171870---bivofaf.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d772ca851---3523766405.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1aeeed2cf---jemuvaluromamewujuzifut.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/zosasimowos.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/25942985872.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/rurasis.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/34026765039.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/24229729131.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/nujadobopikufavufefi.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/87279904478.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/galetudimosirafod.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/76517669322.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/jafopoxozidiwujisurolilid.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109121007011017.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/86559470838.pdfIn PDF document text
    • https://lecachet.fr/docs/files/zepulanegamowez.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/matulad.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/85590119035.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4fa118927e85f87de39501276ea3adc2/sumudilada.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/58080278000.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/sawipipavobigimise.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/26578096336.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/33910714304.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210908093624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=armorfly+apk+latest+versionPDF 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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 10772 bytes
SHA-256: 2f76c9d0fdda38b466f2129cd7d5d9af695409aec0c5a9d8cad26afde0a8c85b
font_01_sfnt_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 18720 bytes
SHA-256: 46697540ff626f6f036aef0899b13e8a3e505a16f3e96e0a2abcea30765f0e26

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