Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a1f3817b89e99c…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 09:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8664082f64ac394ab87976a90d0ae7b0 SHA-1: 844af3345bda41a2eb6aa0dc1e2d20d3396be408 SHA-256: 98a1f3817b89e99cd2cd79c6826f5fa0b008f92d3d541fc8967044b9c83ce154
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final malicious destination. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=discernment+of+the+spirit+pdf PDF link annotation
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zizetofibebi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb1cd1dc9---63961438588.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/kezowakizuzamovojowufi.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/24567961793.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad2349f9b---kelonuto.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/sulix.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/megiwofalibufoni.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/bokukorepenazapos.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/najevowaxodogisivoniges.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/64322379338.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/tenutosisemasolasobemuv.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/kokujajigefoxere.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/32365882860.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5790252e2ef51ed62c8646ce164109f6/xolik.pdfIn PDF document text
    • http://balone.net/_upload/file///30947441347.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/74387166981.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/vefufulafijipawunaj.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/18927554399.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/jetozitud.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/47769855740.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/57504315193.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/69264725732.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_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 17472 bytes
SHA-256: 8f3a67384a2384e91f25e14edf7769a8e3c4f2e32d49f19de30f96192303c32e
font_01_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 10680 bytes
SHA-256: 9b0de82e27e8c0b92bc6d6ae0f300d0b421c4983e2be4b7d680ec90bba74de7c
font_02_sfnt_off00013f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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