Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bbf980c2d37e14…

MALICIOUS

PDF

79.9 KB Created: 2021-08-06 09:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c2bcf43aa9637aaa6112c41d94572f7 SHA-1: f570200653e2cb9e65aa67054722ea60f792ba94 SHA-256: 97bbf980c2d37e14c3ea7fe99249f39f8ec81ff340cd5d0403c9b7c2a222cf7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=pokemon+heart+gold+rom+hack+download+gba PDF link annotation
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/85066357190.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ace0227be78046e4620a34caeab6c298/nutuk.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac025898dd8---10740926976.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/31635767064.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4dc7ed40072f1277fbbf189c7f02815a/wimulipisonasa.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e141b01c6---33624620861.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7c5fbabd4291030d6c3f2a00b1be20db/92016209949.pdfIn PDF document text
    • http://zimmerei-possert.at/gajuliwovopodirawe.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xesepiwize.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/joqni1qvlgodsudos99u65frbf/vijujufalosexonore.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/60397157507.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/zirupok.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/lepaluwopeluzasonidukiwiv.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/lelexemekuxosukodufiso.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/24901048713.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/zanisa.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/warig.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/kagufisuluwiw.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/15084485763.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210605_52587B7BC79338EF.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2vc81g83s004s0npe5e3inh6o0/35726826903.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/70641459271.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9824abfd529e2f49bd1155937de54085/11859375615.pdfIn PDF document text
    • http://vodova51-53.cz/files/fixoresoz.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108e00d0a5f4---51959453485.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_off0000d222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 10876 bytes
SHA-256: 74b3899efe4084475ba5600c23be722d4e3ac3d30f7bd56a68d5a7b6186572ab
font_02_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 17708 bytes
SHA-256: 6c05ec6265b01f88d1b18c044d200bc5cb586c7c3559eb65606e1c55eb939944

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