Malicious PDF — malware analysis report

Static analysis result for SHA-256 5139a937cc6d103f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 04:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c5431145f9fb914a42c94e7a3e5612b SHA-1: 5a5a16ffdbde74ea49f1ccd3896e4c019fbe4585 SHA-256: 5139a937cc6d103f314ec4b54a8ee1ae601279bd9fbcb2c3e033061d739c5552
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, several of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/967e7f045986f5804b4d997d2d47ec3e/52213903499.pdf In PDF document text
    • http://akbarestate.com/survey/userfiles/files/zowolololewozizovob.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/58933835215.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/kesulagikevites.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/wexupigiluburelota.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/xudogojeleb.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6207bcc23---12695859254.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/zinofawevuloboxo.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/mitesa.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/69265294157.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/dobenowevobowasimopurewup.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/kagobor.pdfIn PDF document text
    • https://kiptep.ru/file/89687284697.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b469f4e2a5---75493464683.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/18144137368.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/44456954111.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc9a4813a---tudovolotamoxawap.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/pelomixuvaw.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/86294466623.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/zuzulowe.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/panopi.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/72378829005.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/favarupo.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/59611937008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=game+ppsspp+50mbPDF 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_off0000b46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 16756 bytes
SHA-256: 0a2944900085b6e12572a2a756c75b479c7862661dd89ff6d1f596bb56cd28e9
font_01_sfnt_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 10288 bytes
SHA-256: 8093dd83e919bbd61ef441024aefe5a7ed1ee1de21f7dcde693d0a64016f1c85
font_02_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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