Malicious PDF — malware analysis report

Static analysis result for SHA-256 091c6801702e5016…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 07:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab91a7f60afdc00c00dc5dfdfb32ea2f SHA-1: 5be4d059f5933d5dcabe733151985469782006ef SHA-256: 091c6801702e5016c2c6dab19ab7804116a9ce2153586c3bd071265153ab19d4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, several of which point to compromised domains, indicating a phishing or redirection attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The file's structure and the presence of multiple links suggest it is designed to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://foodvellythailand.com/upload/files/7391516147.pdf In PDF document text
    • http://architettodrabeni.it/userfiles/files/potigimunefakuxere.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/55739668689.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/jukegixu.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/pebirajofux.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/25346957098.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/31793304560.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/66382421127.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/87730253172.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/sigoku.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16084391c8ab0c---26786369139.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/wililadolibibamozutewag.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/dekexoluzavibi.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe877c347f---61677255883.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/1982070037.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/benadumefejikubawike.pdfIn PDF document text
    • http://webbuilders.com/files/file/doxokanewubafufofaw.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160eddaaee9e4d---folejapudikukamis.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/61950777675.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/240mrdvqufv83519oaubeosuij/jesoledot.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f5e964bea461d4cf91cc42a4dab57be9/vorob.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/lalotilin.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01192964ca---gewozidafowumab.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/dasinajasaxo.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/39740143086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+lines+in+autocad+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/36832421463.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B5 17296 bytes
SHA-256: 2ca42b84eeab3669adcefecbf42872adab37e987534f51900f6896dedb0e8e28
font_01_sfnt_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10688 bytes
SHA-256: 1bb8e963f1dce990ad57438bab5a255ab8ef42b37dbdd04f1beeaca04ce321aa
font_03_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 16500 bytes
SHA-256: a3fdefac9f40d0bec5396219ab3ff4c3ae60aa7d077054c2846d9554e4f48b6e

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