Malicious PDF — malware analysis report

Static analysis result for SHA-256 d767f2f7d473b3b1…

MALICIOUS

PDF

80.1 KB Created: 2021-08-17 09:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c2314ddc6683d19923bd348534a9a74 SHA-1: 40384b81260a28861ac9a35ffff76e6819e57f0d SHA-256: d767f2f7d473b3b12e9b0a01f1d737ec697cd3f9b397a0cd2098c43d9e244cf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure suggests it could leverage PDF vulnerabilities or embedded JavaScript to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://verandapattaya.com/userfiles/files/mowoxolulakixug.pdf In PDF document text
    • http://www.ecvbrass.ch/user/web/file/96009520790.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/juvetutuvisatebotalo.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/13698707875.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/33e5a9c1c447a6f3a38ab48353c8712f/ripabifigoxiworusu.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/70612661241.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/9211809510.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210619112356.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/65333933041.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/sunalo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4dacca003a---jeturokiva.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/86578b1a6785df83b991767a3fd8eab7/88587795033.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/bokegewafujogisux.pdfIn PDF document text
    • https://blugarden.eu/file/95480627418.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2d7b14850---58814895363.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/lelojosomafepal.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ddq9l3i5d1v9vgrg2fhsojcl1b/82070510096.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/dobokebul.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210815035038.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/83256330742.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r1o9t88u5mu8kra52v0g77kko5/59161168766.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d3a3a63b---kipilirebudesuzexusisuz.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/xotusidedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ora%C3%A7%C3%B5es+subordinadas+adverbiais+exerc%C3%ADcios+com+tirinhas+com+gabaritoPDF 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_off0000cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 11688 bytes
SHA-256: 4213b8db40efb361a7d93cd8a45928ad391642903d77b80168f6865f74e35370
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 18788 bytes
SHA-256: c56fd959c9b3f7e07b284ad194b9131170b8ff449b0c3b260bf6c0f2e7ab694f
font_02_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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