Malicious PDF — malware analysis report

Static analysis result for SHA-256 833809b5242601c2…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 22:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90bde1b0241fc66205c4e547490f2107 SHA-1: 43e7185696152cdbb76948cf49a94c8fd059b573 SHA-256: 833809b5242601c2b4a8c0aae8761ae69726b8409d95f2ef5366378d3d3539df
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to external resources that are likely part of a link farm designed to obscure the ultimate malicious destination. Several heuristics indicate a link farm and the use of compromised CMS uploads, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://keralabiblesociety.com/fck_uploads/file/vititorewowo.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35b71a73d2---bakiwamatudomuw.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/20027825827.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/94723502044.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf8e983c9---wofeges.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/14027891896.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/b8g5ocfpl7vslaj8ee2l4vmu10/zamejaderexijesijubosivon.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f2a9f287953c8256062154bc4884d2ed/bafopinadoleso.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dvgprfeip9d93rkr18eh2um351/9334033903.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/5979157022.pdfIn PDF document text
    • https://123natura.com/stockages/files/modikogupo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ffb4b1c3751e600acc4352d673784e37/kotofoximo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gasegomatotujadu.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/gixogimela.pdfPDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160815992c1f0b---porak.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbb66a74dc---20134215946.pdfIn PDF document text
    • http://hydrem.ru/images/file/36539884263.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/21708933142.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0a467965f309598579526452fa1d1784/fusarezobofadituf.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/782810223.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/42257547831.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/84719215503.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612509d6d3c21---zimivetijizesenum.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/d0f6921ucqqoq5edklihlfs11h/bimekojuregekasujewu.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/97756719695.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/xeparurewojigimebijeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=english+for+everyone+grammar+guide+pdfPDF 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_off0000c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC214 16512 bytes
SHA-256: 0b1b383120663811a86d61c84aabbba0ab11a2a91078de45b6b1e530e8431750
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 11112 bytes
SHA-256: d0911eec073c2f08b5ed8ccb39810917f4c25bb1346f6220031ec3fbd146a1d0
font_02_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1