Malicious PDF — malware analysis report

Static analysis result for SHA-256 e778d66c1b1177b8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-16 10:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 006c8081b328813c4c7c68e8c2542d2e SHA-1: 02ed5d6075080e0806a71ba1c254108b0a64fd7e SHA-256: e778d66c1b1177b89d0058654cbc0f9fab88f24b77b97e612bb77e68b45bbd01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript is likely used to redirect the user to one of the external URLs, which may host further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 http://kaushalacademy.org/ckfinder/userfiles/files/61202782038.pdf In PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/wisasowujuvuz.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/jibivoko.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16131503110f50---vonisemafagibir.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/dinuwi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jkrt4ctpvlt2c8tokdlu2n2a9/fasixageb.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/94524270462.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/wefagasovegizelazojibolit.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/48658756659.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3a50eb3ba7716bcd3b7256d710d26cd0/10228127409.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/26456256708.pdfIn PDF document text
    • https://tierlistei.ch/downloads/nokivosodaridedowiboginol.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/40268527761.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/81929931829.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/savized.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/92875446309.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/95568036998.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/voxirumuzoxaganegedijig.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109130825323710.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/jakazusewolutubuziwekixo.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/62201097413.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/56999907381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=soccer+manager+2020+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_off0000b3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F8 10760 bytes
SHA-256: 399b98403d83305429f1a20a3444410ca3a31b9b3046ad36a27936b106c51662
font_01_sfnt_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 14740 bytes
SHA-256: b946be7d490702d90e7627231ceb8f363c684db7fbf4a050985f9c5eca70c210
font_02_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1