Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39221672335ae43…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 17:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4f4ee30c75fd29d1b1f2726323ce4c2 SHA-1: 7d8896deb3fd6904c743f7467f0c857f9c0963df SHA-256: c39221672335ae432f3412b8a14a01035694e6da2f321cc01b39be7e300f2041
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure the user into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=a+small+car+unblocked PDF link annotation
    • http://zjgjqmr.com/v15/Upload/file/2021951828441070.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/nirujatagovufizobiwegor.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/71170634979.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/042101548581.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/mazegabu.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/tolusifudegu.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/36907205944.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b09934934d---nobixasarodelipepad.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///wesododefukujajite.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/52088613642.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/956d6091174db906520a743aad2c598a/dubonezuxizikizole.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/xuwolizodoxizet.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210908164311.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/45136780786.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3a9960518252e5de6b2883827ec4a9a9/podebakamuwuwumunel.pdfIn PDF document text
    • http://travellerisland.com/files/nopudesaxalejupip.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136f79740c77---gugaz.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/zuxeluzogetuzom.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/zarigadisezifaxava.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/61000714041.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/xitibusage.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/sonamarigixujowusepomes.pdfIn PDF document text
    • http://mfcpavpos.ru/file/53648985742.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/mifapavexusofazax.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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 17284 bytes
SHA-256: bcb016ce415f59833b76db03d8d6a9fa5824e4fb90df8983f46e7d21f6e9eedd
font_02_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 10656 bytes
SHA-256: ef0912479328e7114fe985aa85bd4b5519f18ae894ab2e41879a86365ccc6542