Malicious PDF — malware analysis report

Static analysis result for SHA-256 35714ce75be53c7d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 22:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d4ecbeeacd091352ecef70fefe4caa9 SHA-1: f3fdafcb52aea0e0da900a229daa6c2dcf699f74 SHA-256: 35714ce75be53c7d2d40568f6a73ca40ed1388784e808ea6b7a5f451e7caf170
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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.
  • 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://hejia-ele.net/upload/rilugivemavezonuze.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01f291df6b13ba88fba66af3e9fd67f3/30151242432.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/8682080481.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/44923239421.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/22472374626.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/43245003253.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/34431739021.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210915_2C8FDC40856597FA.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4d3a988b---bufunamipor.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/72091486621.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/48136658232.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/mokajetagado.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/futunarowu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313389dd606---48827455885.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/91678126956.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/46659912745.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b394bc1831---nunisepawubefajegedip.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/mopiwejifenevire.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/97702320461.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/garejujanenubivuwofalov.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/kixitaru.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/49597614785.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/354821a885d215521319475e741304db/42417419415.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/39036719817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+white+2+download+zip+filePDF 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_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 10852 bytes
SHA-256: b1387d6d938336c4fb16b526cfa08070f6d4ecc28606970f640b6d2178c4bf8a
font_01_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 18720 bytes
SHA-256: 5475120fb1e353e55983ad7fadc97d58e8c2599186891f09619054daf3946c13