Malicious PDF — malware analysis report

Static analysis result for SHA-256 da99d5ecc39e28b8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 16:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e75a51d57b52c8170a7e32f32d5a652 SHA-1: 50906a0664eb00d6444dbc8d78aeb3982941e4bc SHA-256: da99d5ecc39e28b8dadb6a3a98b631d40b3a80aae0ad4f118be30d65bfb9d5a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm pointing to compromised websites, likely to host phishing pages or further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent, and the ML classifier output of 0.997 further reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/05165c0bbecb23207999c634776a59cb/subesowotuwowu.pdf In PDF document text
    • http://cardealer-space.com/js/upload/files/worodiwolozupisupenuxevep.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/37028796002.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/85872291847.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/54638652002.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/15196057972.pdfIn PDF document text
    • http://biomehl.com/images/content/files/25443129612.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d806dfc27---tefejizoniraresaborix.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/34496454501.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/voxurobadepabe.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/31e5ee3a20f9fd7ce8d326f32b6af8ca/nekefasovev.pdfIn PDF document text
    • https://inks.bg/userfiles/file/15771607495.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161321c929bdaf---83502254049.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/24778975922.pdfIn PDF document text
    • http://info56.ru/userfiles/file/89276824704.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c4trp6kugvc1ii5uhmasbavq5b/risezumekopuzusu.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/46999707130.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/84444317382.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/muduw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161396dbc9b2be---zixobizomonojatekikejurib.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/lododibiladuvupa.pdfIn PDF document text
    • http://teraval.cz/res/file/69194303050.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/toxosuzufenavovaguvewos.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/58746958782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vishwaroopam+full+movie+in+tamil+hd+1080p+download+tamilrockersPDF 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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 18592 bytes
SHA-256: 6c48ad9c99363591b4e2e4f9349fcfa527abd6b17f7576633b6f3752aca6b7f3
font_01_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 11580 bytes
SHA-256: 0c8fc99c61abbb51e1cc3c77684aa9cd14a5d55d6e878f73bb0f4d08be286f7c
font_02_sfnt_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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