Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea28f9ad380156d0…

MALICIOUS

PDF

227.3 KB Created: 2021-08-15 17:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ef63adaf64721a2f0120881cc4ac5da SHA-1: aed74518bb9779be9b5c1930f4df6dadcc7be278 SHA-256: ea28f9ad380156d03f79e196f27fec8e237c29cf50b1a8c213b376e37c17da43
134 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external resources, including one hosted on a compromised WordPress site, suggesting it's part of a phishing or malware distribution chain. The presence of embedded URLs and the ML classification point towards exploitation for client execution, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ubranni.com/uploader/files/momexojexusetijiwixutura.pdf In PDF document text
    • https://autosaloncenter.com/uploads/files/81134639909.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/duvubolakeziropetuvigiwuk.pdfIn PDF document text
    • https://parfumzone.ro/files/file/28834177245.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/zulusobigoxepuriditesazib.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021072101142773499.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/penutipikifagiwofevuram.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/12635264234.pdfIn PDF document text
    • http://domplus.su/userfiles/files/wusifurupamolavebase.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/fd8d42ec9f38d8c7c83ebdfa1d070ebf/92332480100.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/83391120598.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb62aa7d1b---basiwi.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/34593177856.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fea15bcc2f---jamuxosa.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210723190208_h5p61s.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e22cdd0dc6356177edd347a9a164deba/58495558807.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/barefudimip.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed33083fc---fulebizatanowiwavokep.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4961a868---vaxadobeso.pdfIn PDF document text
    • https://angkalaris.com/contents//files/84057429177.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/486a854dff94ed07ac7dc985b83535ba/fepiwekuwasenevadefagogi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1143b82a8e65f0e112234b7aac922e3c/lanatorovoxutizugi.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/38750762134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=construction+claim+rejection+letter+samplePDF 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_off00031e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00033641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33641 18060 bytes
SHA-256: d8971f048a3cb2f4752edc598f1ee5e2be05817a5ae9101299e6b93684ffe4d2
font_02_sfnt_off000365e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x365E1 10796 bytes
SHA-256: 83f4e342db25cbbba6db6682b0fcc5d559b5b0be49567a829c08b8c1b9d2a8c1

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