Malicious PDF — malware analysis report

Static analysis result for SHA-256 404743241d5cd95c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 19:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2acde62b84d14254aeffc905e3b760b2 SHA-1: 94a964fe9b9e77a52d319774f470a62128a0ab6e SHA-256: 404743241d5cd95c931de062db133dc0ad644009d627d711c4b571ef1df33c0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://gilboamedia.com/userfiles/file/76518337997.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ca45c6fc5ca63e236cffcaf3e113aed2/jujoji.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/92221687324.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/mofive.pdfIn PDF document text
    • https://petek.biz/resimler/files/34241782813.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210917_80A23A827F8F72F5.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/borugefabimepusufil.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/zoguxodofokakaza.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/98578442006.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145a6dc27957---67282740696.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/setisepobobilar.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/lulatanin.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/11526647819.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/lasogifufuk.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/xagubobikelevoled.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7f92e9e2eb10c2c01ee7ea27a76792f3/kebadezedipojubiwita.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/fenanobodasededarozupogo.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/kojoramix.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/930d5t5dttnddnnbccqjnivffs/suledosujeb.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a02b1a04---27098408510.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/xukereretofijusujugosu.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/4952808453.pdfIn PDF document text
    • http://agro-partner.com/Image/files/14721491000.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/48935875377.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/sedamuranavexalisumipu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406fc195f31---gojijekigakuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=application+trading+androidPDF 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_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10372 bytes
SHA-256: 3c8feba9eb8f8454469ef3e2a11d5171133835b9b6f9798aecd2bfddea392ddf
font_02_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 17072 bytes
SHA-256: d983f652ac4b486a7966f778a6ba321b88a7580b48066d1b302d5a2992e5dc12