Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fbb3591bed90ae…

MALICIOUS

PDF

106.1 KB Created: 2021-09-01 12:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6997b75d28680ef2d7127ae1eab89dca SHA-1: c79c9be5f3600a788e41b87bb58837fca98eb990 SHA-256: 04fbb3591bed90ae1d1e8a3afc1aa5377875bc465facb8db52c5963262ec96fc
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links are designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wurikuxukepofota.pdf In PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/nr2sifas788om5nu5mmj6e3qe3/vetexat.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afd20272087---gevasebadelatewiv.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/fomarifelufugadubiziwi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160714caf655b5---39518074490.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fdc555a3468eb999e522b47fdf8fc2eb/jasoxopobufariga.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1fdd1c5538915c9ee61f5bb35327504b/56755179785.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4fd18553---52304546712.pdfIn PDF document text
    • https://emenu.hu/editor_up/moropovejibaposoli.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/golupotugumirikagi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/83059505748.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/fuzikawup.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/19594080797.pdfIn PDF document text
    • http://goldmustang.com/files/files/894618301.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107bdc1b0f5e---77312495834.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/tozuk.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/18529221631.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/guwuwilisijawigemuda.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a7817f2e05eb2acc6045a22ccd2bf094/foxejokujamosugot.pdfIn PDF document text
    • http://asustainable.com/global/file/96796211187.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/rowurolovanofaber.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608513774d34b---89848627980.pdfIn PDF document text
    • http://planetamama.ru/files/file/24340510843.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/sirekuwazamipu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe59401019---41472099905.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6dd5216c257bb3a1d22a3eacabce8c0a/81575938070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=discharge+from+female+dog+urethraPDF 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_off000137ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AB 10920 bytes
SHA-256: f7f08082d2a8c25240cddad4f202727e3b8abf8a41cf456054b874fc9a7a31dc
font_01_sfnt_off000150c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C6 19148 bytes
SHA-256: ebd9fd55b8252f64f46d9b15796c928697c3fd06fe931aeedef5db1d599d44e1
font_02_sfnt_off00018266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1