Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23ec374f95718af…

MALICIOUS

PDF

83.3 KB Created: 2021-07-02 07:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a999075889fee9202f57baa5e006e79e SHA-1: ad3e51ac591110403d5be7d2f81e92c312caad91 SHA-256: f23ec374f95718afa68f3b2761fd57bbbb6fb70dcb8088cd086cc148975fcaba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to external resources. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/j4clvaafgnis2eppse7eth0084/14387426949.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/j706pfd8f7rd9qndcio93timg4/46761611425.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/78047274431.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/3ddc6c39a68f92b2fef76ffbc1e9e8a0/30052528271.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/79670461974.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/br82poiembgokktgkdohem4hs4/18435577320.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607441e3a43d3---28598809628.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d8b6999b0---mopolidazem.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/fizalumarizela.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/18253951647.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7524be89---6024344975.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609010d1d000f---tolafumewebuzemite.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c08a0aae1d586da7ce91b909ded6fd73/fugofibenelojeteselijorer.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/epfdgobs91q53eae8ie8qm79v7/wubajedinanonikuvafa.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1c764030461d167c5c4afd10bcaaf088/28353440725.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/91376172449.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/woxudumurawezabesamidamo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160824b7d60510---vuwegadolugisovedegi.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ffb9138f7e6d10e1e346154bf794aa41/80390097883.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e11ceca7---47603547138.pdfIn PDF document text
    • http://topas.lt/userfiles/file/natojuvoredaturimoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=aot+2+gift+giving+guidePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 15840 bytes
SHA-256: 186d992123ab502223b6fb2549dd8b1804f6962223d54f262ad731e95d9ed475
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 10320 bytes
SHA-256: d28ff40a90f1aeef1c19f1a96104e8abac7923cab7ce5fe0b30a0dfe0e146b71
font_03_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 3148 bytes
SHA-256: 229a0cb398ab0bd76502003e4ca3c97cf4f5ff6d2af06ac1e75d94629bbfddf3

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