Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad81b2a0f20eb12…

MALICIOUS

PDF

89.4 KB Created: 2021-10-06 18:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2842778e508516036c0fd2663ec1758b SHA-1: a4e2cb0141efabf2eb77ea72cacaad9a2deb7408 SHA-256: 3ad81b2a0f20eb12758854ae6da0ee3922605a196555c4879ea0e42cf70341e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to potentially compromised WordPress upload directories and other disposable hosting. These links serve as a link farm, directing users to download further PDF files, which is a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161372029bb7f2---gazetosodip.pdf In PDF document text
    • http://thebankcardservice.com/uploads/files/zisitewiraruwov.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/39698933402.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/xodibosunafukuzapudi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cbd4a3ff7---kekexarezogesuvufujetidi.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/78432301092.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/56600936072.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20211001_C6155AFD08850455.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/69575684326.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/15034672422.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/jefubaxak.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/tabadopadogo.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/64475108666.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/gopoxolufivasujige.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b8hfmua08hub4n83eachjk6o41/vibapifuwukoga.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/53682698882.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/wejekagovopoxafude.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210909021946.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/vurapavizobodipedivowida.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/73893030720.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/xizenenaliwafajalozapawog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cell+questions+and+answersPDF 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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 10604 bytes
SHA-256: d72fb4f3f808d85fb5137768ec14f44e5edc28e847fa4919f524676c2b78e84f
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 19320 bytes
SHA-256: e57af117f2fe49d42ce77d60bbee1cc96d73b4ae6a22964fc3d7da0508364278

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