Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6a00782b40eacd…

MALICIOUS

PDF

86.8 KB Created: 2021-08-15 14:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1cb648a5d5ad7c81ca84cb194a9445c8 SHA-1: 7a6a53b0738ef1c9c568d49a0648c0c6db7cd619 SHA-256: de6a00782b40eacda3bfc60dbf9aca03f50269c25802f077e50ca3dae5d0dc7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=fahrenheit+cologne+for+men PDF link annotation
    • http://rbtyutj01.com/userfiles/files/11617320073.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ec51aa0e---77362875181.pdfIn PDF document text
    • http://vce34.ru/attachments/file/70255642248.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097254186fab---96958375004.pdfIn PDF document text
    • https://onecre.com/images/content/files/74090777017.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/17469019321.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/8377691327.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/15928947116.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/70864807046.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/78423019031.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764afc1304d---60327422158.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/bizafoditoluluw.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/gotuzoduxodajepexejesamo.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/kemoded.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e08392dbb50d8e42767bce6d1327c5c1/3029871745.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f2cde668d6abf1e620c205e031e8f13d/talitemabexapexasavena.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/vowobadebagusejidokosove.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/23067383276.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e13c25fcc---74508680615.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021062821032373499.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/zejuje.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc0fbe6c13---10458309763.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q9iano2l6d90eqfrkn8iea91d7/pividudejuzojidu.pdfIn PDF document text
    • https://lapdonline.org/file/71246671008.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_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 10592 bytes
SHA-256: ba59be0a32fe8f101d9e3f30cf6f6268dcd3b1554a4cd6857f0d7325c77abaa5
font_01_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 17600 bytes
SHA-256: 697d5aed12b7f0a6294778b48127308cc7e85a8777e61297191d441008ed8918
font_02_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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