Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e3ef0f007c3d03…

MALICIOUS

PDF

97.1 KB Created: 2021-06-29 03:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e61ae926ed1331d6ce93c12aa5b9bff3 SHA-1: fb565dc4c84368311587b2dcaeaa4ed09ec566c7 SHA-256: f0e3ef0f007c3d03f63fe2c8b0867bbca5d622577c51d1f254a89b3ebce85c47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to distribute files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080196e7edd6---kojeb.pdf In PDF document text
    • http://dush-kz.ru/uploads/fck/file/luwinejutamalaganatosuso.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/778489606a13d362612e435eecc119a4/nasaxubamafat.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/4h09fbnm45dfc8jon1opp6btog/supepudasurak.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a40907635e---18400346768.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///zufufaxenuwijokurisuwa.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf57aa0ad6---dogalina.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nnkf7gj368qgti9ou1h6plclkk/48564205728.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e957ada83---sujepokujariwojoj.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a1f60f5a64e1dddcead34d88c0a6601/raposopotawojapisawovujan.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b21be45748e8f00d6f93741e87d2efa8/mafuwidosuvaronoren.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4702fa3d---31671298166.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/sideputewovubevozumuwuw.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/34690983627.pdfIn PDF document text
    • https://parfumzone.ro/files/file/41619101151.pdfIn PDF document text
    • http://cy2hand.com/userfiles/64925245907.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609818444e449---20073989328.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160832df290c0a---95536278608.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/79935856c52a375fcb3893959d03a13f/mifagonotemibarumake.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/lopatozuwemixet.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/famurosezagenuwixesazem.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160af7942d3210---23140993928.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202161802811.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7141f5592dd6616586e95558b45b0a09/83772162002.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9cd7dfb97---49009671423.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/52926861460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hr+interview+questions+and+answers+for+software+testingPDF 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_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 10872 bytes
SHA-256: 1e5fec62cd99a4701bd69a73bb13bddfc7b4b2c3f14f38cc7b5382d55e2fd698
font_02_sfnt_off000149f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F8 17300 bytes
SHA-256: ccff7c77bbea191122a81cdbf393753c54363d0827d0d41b920f75f9bdf5d388