Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9ba1deaa0c6a97…

MALICIOUS

PDF

86.5 KB Created: 2021-08-11 19:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddd96faf60aada0c601dcc01fd174f81 SHA-1: e6fe704887dd829808b4d2d422e94a10ca6c3a65 SHA-256: 5f9ba1deaa0c6a97e4146e308ec80923e0f9fba3ecf59aae4f95569a02ca8a2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised or disposable domains, suggesting a link farm designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=fundamental+of+computer+pdf+mcq PDF link annotation
    • http://dalaichau.com/files/meforusepunotuluwexa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a1ac80d5---16105890648.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a61a33ffd1---womamekoxukizefesun.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/sipisugi.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/mizuzovorawelijurolawaxof.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee45f36572---vadazo.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/wekakob.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/rirolewedagu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8u3t8ekrbitkqeeh0811dj2l8m/4637828743.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/domonisu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611249f2b8b57---zowomodusubefujifanusi.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/22027195096.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839aed8b41---74276699688.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/pulijikezizoruxi.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/tapuzijerusiwowewi.pdfIn PDF document text
    • http://contactconfiance.com/files/files/lezuv.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210623184638.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210627074926.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e3bced8caa8fb6d564d23bce6e260f2b/zosuxorovazadulitivejena.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ba6f9af4dd9e42b90db48bf1b586f43f/vuxekamazubokuvudewise.pdfIn PDF document text
    • http://sns.hu/_user/file/rutavukijapekiluzenere.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/47850071869.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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 17464 bytes
SHA-256: 9f57e57bcff41ba8b6dc3e9f3dba9890c92c8b1285679dbaa6ab0480ae09a41e
font_01_sfnt_off00011bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13412 10744 bytes
SHA-256: 2cbe76cffde64e8c06ce426d464d1b91a64f83580e6ec02eef4f51ce8fe19666

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