Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ee76898a785dd6…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 08:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0de32c6b168259609e44a72e37b0a68f SHA-1: 7cc41206337d3706d61515f9e6b7a2ace19cdbf3 SHA-256: e7ee76898a785dd61ffdb5ca43ed0d85c18c1635ce9102e55e01f077f590220d
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links to external PDFs hosted on compromised websites, indicating an attempt to exploit vulnerabilities and redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the exploit chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136dc21b3a54---21434283110.pdf In PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/76744861604.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/topapuwumivibukiji.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4c68b6131---wunebamabidikik.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/jeleb.pdfIn PDF document text
    • https://panama4d.com/contents/files/27897466319.pdfIn PDF document text
    • http://packamate.com/userfiles/kugebufomexitoxarureladun.pdfIn PDF document text
    • http://hrudolf.com/userfiles/wafen.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/mojikafatotazosi.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/fejipo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/23957992035.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/17251736317.pdfIn PDF document text
    • http://slsnn.ru/content/files/88961239073.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/nafakedifikebufopomalif.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/pipevataguxibibagefot.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/nakebuxawaxajir.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/febamigoraviferobezibu.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/1470669703.pdfIn PDF document text
    • https://ruja.lv/uploaded/file/90191322890.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1615009bc0fb9c---gumolikotejovisewadobupa.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/45609428070.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/tobefobezatixogimug.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109101824238423.pdfIn PDF document text
    • http://ducnhua.com/upload/files/10518501863.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/217ee16759f77ac67ededaae63022ded/87005959691.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/fatesasabegeburadofebeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ff+gba+romPDF 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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 10036 bytes
SHA-256: afff3cbe6d77bf432de76aef73fde3ff1e933198074c031d9f7465996981b280
font_02_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 15128 bytes
SHA-256: 4719c6a5a593d34b619faac2b664c1913b757fccec5ab9e656e96105af8fc84b

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