Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed98e0f9737efead…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 07:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9bc22cb175e6e6998fd7595ef0121465 SHA-1: 2c4ae8df56f11f2a436af7fbaccfc049d3e36c12 SHA-256: ed98e0f9737efead9354f3bff19f2b4f3a1464b28c42f4aecba7c9a2cdd76c20
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://wastran.ru/uplcv?utm_term=choices+premium+mod+apk PDF link annotation
    • http://mega-stainlesssteel.com/uploads/image/files/jijazakatudapo.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/20007626288.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/63098415847.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d71c4e8e---79089807910.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/zutan.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///2512497376.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/danabopumu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/vifupatoxeranilomuxiji.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/56692968258.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/85900603791.pdfIn PDF document text
    • http://letdentalab.com/img/files/87477495099.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/werojuzilubejexafa.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/gewas.pdfIn PDF document text
    • https://carlojans.com/cms/file/31003386589.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/morarokogozupilida.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b5993a4d05eae206d1eb81c3c40312a3/xirevaf.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ede3da070b06d5ddab6ced1e1d475b0e/zifiraragisitisexanukuge.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/30a28670f37f32fa99e36996e18fca4e/vigup.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/novevu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/fcg4591nh4ujrkbar92es17p90/21321064839.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/xemunubojenoke.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/zekelite.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/91448345936.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/gibubugajogimazifajejuxob.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/fizorufa.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/xuxakazikapowo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f55869b7b---metigidelenosuzutarerux.pdfIn PDF document text
    • 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_off0000d20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 17860 bytes
SHA-256: f948ad5aa2ca63fb2e1d3a1b964f531622129b3b0a7bcadc71d99ca2573f1cfd
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 10756 bytes
SHA-256: bbe850bceb6966bc06f301c71e0042caa09664cf1ad59536e63e307757db9def
font_02_sfnt_off0001191d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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