Malicious PDF — malware analysis report

Static analysis result for SHA-256 336c5a2bea002cd1…

MALICIOUS

PDF

74.3 KB Created: 2021-07-02 23:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d482ffb7a07b8928eb5f9de07ac13fce SHA-1: 202990fba64456ad98eeb284ba993291f271943e SHA-256: 336c5a2bea002cd1be074a8d26cf9299aee5ca5a56d2a4016353f5014a7311ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users through these links, likely to a phishing site or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fbb2714642bd1a7ef610a16512da22af/lavakimakil.pdf In PDF document text
    • https://mimpi1pusat.com/contents//files/zifivuminelaroz.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094151bf3890---40368210563.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc45529ffc---68761052395.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/91c5775a5e87525e6e2582cae8271ec7/nenikifije.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0881fb8555d039eac357b212e76845d5/62630231186.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/govijetawosagusolikasa.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a19b82a5dc---38393584316.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/gepaxovisarizubumadom.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/887db07d74d1c8933adf4c0f1ee9f5be/sasubikimubuvor.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/tjpcpfbhoghpdv0c31pn5kg5d5/wepusozuwojerit.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/50910319482.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/sujivexasimuxupelol.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/62181418034.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/16ef03ea37b2659fa4856d9ef1eb8c55/kegiwenoboxuz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/47ca68a8b13321689d268f34d2a327fe/26144258968.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/33861088643.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609477e3cd3fd---soxojotuwadololoxugodalom.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/7697004403.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fa59e2a21c3c11e487e043b66b868a32/46139921059.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc252ae41---pozobezewiludo.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/519009962.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a637492a4c6---65904414463.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f092e3765ef77c2f28a332ae5fa20dfc/7287177186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=principles+of+accounts+for+the+caribbean+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_off0000bfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 10956 bytes
SHA-256: 43e28c0a667ddf5db6c6dbf6b193bfe2bd74b564b435fd340fbf8f335c4401f0
font_02_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16484 bytes
SHA-256: 15154d9ee7044c7a28e7dd8bb14ac55d0bba440117aa00020456d8de8b0a19e8