Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3c241d46b3f73a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 15:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fda0b1eabe13860dd73c32ee84f086f SHA-1: a68d351ac1d62a0ba4cda2d0d6e5286922157554 SHA-256: cd3c241d46b3f73a1f1102ead5f9faf20db445900a046d8bc7759761f7eb6923
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a high number of links to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a 'download button' lure further supports a phishing or social engineering attack. No scripts were extracted, but the overall structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ekhoron21.mn/uploads/files/14851601597.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e57696eec91da581b1941ec877317714/supesazolofirisowun.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/marezokerumudupo.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/2871768640.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083e355dc4ff---ludajepojotidopun.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/jaredogalabota.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/42951881482.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/notupovugidewunafizadakep.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/85846770762.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/fabimetokozeguzu.pdfIn PDF document text
    • http://bociany.sk/media/file/19210592814.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf506b322c---wijekuba.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/83399822909.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/timoxusaxuler.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ffba478d4e57c35997cbf5f5f90c3a60/nuwubonejetenupunikusaj.pdfIn PDF document text
    • http://dd-eng.com/files/files/47330302429.pdfIn PDF document text
    • http://proxima-design.cz/files/file/8482217735.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/soladafepisopikevemigakim.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6b26537f0f927a9a8328b548f165235d/guvajug.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/827059b98e3b540ca1c801cdc6ede95d/disixapifi.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/vazixifepatapopubikol.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/84a392dc6460f0b6271d2877a3345876/12249871900.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160960c397017f---momoneweburog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=area+and+perimeter+of+rectangles+and+triangles+worksheetPDF 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_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 11224 bytes
SHA-256: e260ad84293c3e2652754a4378d6fe90632bdaaecf95e109a1ea3a76ca7995b3
font_01_sfnt_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 17336 bytes
SHA-256: eff0a4a7a3bdfa8df94a5aa9353a49c2d6caa733e1bf7d9f06921b362233c36f
font_02_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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