Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ce84992e96feae…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 10:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a37d70a89488995ea471e2cfcbc4c87 SHA-1: 6ee7a903c55a83b3f0224cb189c56d59ad3c0309 SHA-256: 52ce84992e96feaeb005cf267f7d3157447ca7436e728b9a883f5b644dc10969
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

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.
  • 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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4a10db80---73490082049.pdf In PDF document text
    • http://48bulls.com/js/upload/files/78283225806.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/42827613815.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/wafebinamawukakunopako.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109040402109752.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/35264889315.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/68503116016.pdfIn PDF document text
    • http://bociany.sk/media/file/rejivisogovida.pdfIn PDF document text
    • http://santehnika34.ru/images/file/guvawopuxoxuz.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/66615836834.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131048934a5f---1851513854.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109091653365106.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/kabunixilexetosuxejed.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/gitupofozabazemavopitup.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/siwazagipu.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/91648436716.pdfIn PDF document text
    • https://ocw.tw/uploads/files/88202099483.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/8668492552.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/kixizit.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/898e26ca6bcd84b354148acd87acf0c4/21927413055.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/bebavegavotuto.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/11626183971.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87d1d1879---xizoriwobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+san+andreas+a+apkPDF 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_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 10260 bytes
SHA-256: 6e0a1e73af3494fe6972c11adc91398e7cd8cabb71be10825351f2e73ed1f00b
font_01_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 17384 bytes
SHA-256: 7b0316a95c0003a2f189aed0de61a477b18f8c29a8ee6d47e366613f5d2ddfdf
font_02_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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