Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cafef79f65dce2a…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 07:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5bec1b7be6f7e4635e801dbccbff6b6 SHA-1: 2b91c22591d2a73c762499bb31b5a284ff5040da SHA-256: 9cafef79f65dce2ac5520fd62b4c5c73aa50e5be6d4fe9d48db94cc1a2d6d548
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing a fake browser extension or update. Numerous URLs pointing to potentially compromised or disposable hosting were extracted, likely serving as download locations for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://maduraigarlandshop.com/userfiles/file/61861154289.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/17739330109.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/79043507866.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/37054775971.pdfIn PDF document text
    • http://aps-mes.com/files/file/26337220075.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210521141840495787wiglrl.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/36945d4a3ffe09bfdc74e6b50b65031e/juxulofej.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a3604511ed80a163cd26ab8959cb2069/fosabez.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5442c303---mivosi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57187752e---72072433762.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/davisomamigowomubenu.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89a1aec34---78076772072.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/21ontr1s3i1f08so7l0ot88dro/fekekez.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7734a5b6f1---fepomijedenazabamepo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd57f9170a---kozijuwore.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b5qupi58jkca0cmfv0fmps8450/58051135801.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4c2fe247002e3a1a17aab30ff88f5751/sezerepuboniziriru.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/58724981289.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097d3a8e69b9---95709498239.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbf23fa2a---bowidilazipitopovamerok.pdfIn PDF document text
    • http://unsersohn.ch/images/file/96570437666.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608448254a87b---81276307008.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/021142134135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=if+one+dark+and+one+light+line+in+prega+newsPDF 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_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 16988 bytes
SHA-256: 61d77780767cb75f3f4b994223c4a47138e751de06869e8628e6fef4cfc40934
font_01_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14280 10904 bytes
SHA-256: dc0bb68e6c8872e75e8b9fb8ab5e3afec63315b0370ef75155e6dcfc4d232da8

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