Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee7528ca54a55bc…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 04:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4854a92cfb479e17134c35fa08ca30a6 SHA-1: 3db82e84d239fdd85f9476fd598b28148a1c53ca SHA-256: 4ee7528ca54a55bc0e5c408658f3b1a5e2267db4e71c76934240d12d5c71fd7f
156 Risk Score

Malware Insights

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

This PDF file contains a link farm directing users to multiple compromised websites, likely to host malicious payloads or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to WordPress upload directories and disposable hosting suggests an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://refour.dk/wp-content/plugins/super-forms/uploads/php/files/fa9148744425e8c01106217a8b18f80e/buxixokasodilij.pdf In PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/23e9b5932cdbed45a8aadd4a15715e32/79405428067.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/c1k5tl09jad50vt5bak0v3i17n/xofule.pdfIn PDF document text
    • https://unitjaya.com/contents//files/fuwikuzonazazubufusu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/25714266640.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a054345b4d2---tatopuxuke.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/25299754167.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/jeburad.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c436181c74e---62757447664.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xuxodoxogosobuz.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/96140200441.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/p77ohjgivghep23imd4sc3r2lf/38965598196.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/71293191939.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2aaf7e85fb---72106398570.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6677378eae---23010091733.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/45102655141.pdfIn PDF document text
    • http://ranagro.com/files/28246007039.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jabizolitojodokatewuvili.pdfIn PDF document text
    • https://www.casestilistas.es//ckfinder/userfiles/files/35402456743.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/dc907f3bd8cdabde19decf781772bab9/69916556716.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/47964019072.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/45896299592.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160848e46cf32f---wusemewasedokemabeditosi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608910d36cb5a---99488005393.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/6819843397.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jjpe8o28enqlqrql6lr2cf4f54/59990140336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fundamentals+of+historical+geology+and+stratigraphy+of+india+pdf+downloadPDF 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_off0000c186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 11344 bytes
SHA-256: 3eac12d347cf2ff4bc440c76e21c8de600b28c56ffcf2602151e89ea26187dbc
font_02_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 17236 bytes
SHA-256: bb4b775bc036805ba581d92a8157e7b440d533e5598a27aa25cccc1296efeb10

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