Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df8c4482215f0a0…

MALICIOUS

PDF

86.5 KB Created: 2021-07-08 08:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee802c9d8eed8c50762aa84d3e3ee0ac SHA-1: ebbc0772762ee6c605b8af3a0fe224c699f27f70 SHA-256: 0df8c4482215f0a0825e5f4b7a92d5513f287d64bbd7db9346d46a80e09b34b6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials or session tokens by tricking the user into approving an MFA prompt or entering a one-time code. The document also contains numerous links to external PDFs hosted on compromised websites, likely part of a link farm to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3pmt1ms62itihtdh7rq4fuehk0/gelonanofabixi.pdf In PDF document text
    • http://cokhixnktientien.com/Images_upload/files/dateb.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/36657605810.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57f9022c1---kezitetugo.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b589c410ee2---nuradutadavaseridexajim.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ee73b524---bagonugadabanegunamatob.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210518174722708765xw9p64.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820afd716db---mibuxivufurakakerujisupuw.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/gujutorejovojotabo.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/11135718051.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210605144730.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780eae0faa8---25763549731.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/v9249oviqta4s4rrmrm222cv19/fuzijepelepatezitotibiwa.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kisafetibeguga.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/timt0obqufbmhj5pceo8691s5a/6039130156.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/78409050500.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b5f83917---fomifudutakod.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db8f6289e---rawupibimasebofiminudifaz.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/71623821755.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/11308545724.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c5dead2fc2de996fef0e26bb252d2aaf/27204472673.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/85566556482.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/24499786866.pdfIn PDF document text
    • http://envigest.cz/upload/file/riropapuseziludime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nta+ugc+net+old+question+paperPDF 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_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 17236 bytes
SHA-256: 0f2ee756b0a947b9eb5fcd61a1e18e683710e6121c4a1412d12f9b111cb96b57
font_01_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10912 bytes
SHA-256: e5cf6f919709f365e80b25db55b1b4810edca3f6561dd6c8c06f8d27cca18339
font_02_sfnt_off000134d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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