Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c719af06dabe2e…

MALICIOUS

PDF

98.1 KB Created: 2021-09-15 00:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cd5dc1fe2a8ac48fe0ef6dfc2876112 SHA-1: 65fd82f789d92e35271abf4d56c2a6db65060232 SHA-256: 29c719af06dabe2e0c85b7988a36ec382051d2bd3808d491482fd6d86ec71da5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://leise.ru/admin/ckfinder/userfiles/files/bulafipujipopipuvediluwuf.pdf In PDF document text
    • http://msdoubrava.cz/foto/images/file/kaxetuled.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/dimopidi.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410d69d886b---xapolebub.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/98961041764.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/lijujemaluba.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0d35cd4ca---senugoraxizanet.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b55f6849b---31917204383.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5a5b12188a9955b2f598ba48c2ee134a/61176659494.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bd8af1a81f1d7962b2ebfbdbd44c809d/jevowogewe.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/xonox.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/noxipi.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210914_165525.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/xuwomidalanubav.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/65719190400.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d9584b1e---80608641471.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090702515429.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/zidefutizote.pdfIn PDF document text
    • https://bachson.net/upload/file/fisulukexuvarexanodef.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210913_7F3891D41780A4C1.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/nepufomimu.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/dowosol.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/mekuluwovod.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/36745874874.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6f18ac3---88437123765.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/nuvezijasuwixivav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+android+media+serverPDF 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_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001336b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336B 10484 bytes
SHA-256: dfbd9ad15101e4b5417b6f3df6bb82494dba359f9c403a8f4072a345e7084758
font_02_sfnt_off00014b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B49 18088 bytes
SHA-256: 4758f68884316a13979baf5ae40cdff2064c5c850ad4cd1115ac16e0ee20eee7

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