Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2d721cfb4f83e4…

MALICIOUS

PDF

93.5 KB Created: 2021-07-17 01:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22ce957f7ca30d1587a87a51725278a2 SHA-1: a0f0704c5aa9c18777a887b3542a268ab15a80c4 SHA-256: 2c2d721cfb4f83e4335a51c8ad35b0a895d194673c9d93d7c2ff4128ae348cb9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889489cb146.pdf In PDF document text
    • https://worldmedglobal.com/userfiles/files/24219954600.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcc0a08f5---velisewakalugemimajaja.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/dafawokedewe.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2c054f80---3128838905.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/bfbcf64aa6ababca502c92458187426f/98727036797.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8a328d58c66f0a4df65f226d584a3609/54846509019.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e168fbe9e1a---xoxarupodezubilebaduku.pdfIn PDF document text
    • http://greenbrier101.com/userimages/19063744165.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a1e454495a85aa0542f89d6e75c3c833/puvipaso.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ec2d10d9f565f30f370d74de576bf445/47576518063.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c414babe---kepavadetabojesuxujod.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/bokuw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wunok.pdfIn PDF document text
    • http://ubest.ru/images/file/99577295236.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/36683238169.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/nutevo.pdfIn PDF document text
    • http://954move.com/clients/4890/File/92771627109.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/49887430413.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9990ea2e---68092451211.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/3811842396.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051005505773499.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16083041c36ff8---vefasivegadamodosusarare.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/61484480897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+arch+of+titusPDF 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_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 10376 bytes
SHA-256: 0087a966a11591f8c20c7c1317e9298737e7e00fae3ddad50f059ad72a3a2760
font_01_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 18684 bytes
SHA-256: e8c46b60af56e9850fafefc56896e65c93f1a582b968f063a80b8a8703f3ca2f
font_02_sfnt_off00014f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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