Malicious PDF — malware analysis report

Static analysis result for SHA-256 665e1a0ab5d78c5a…

MALICIOUS

PDF

73.8 KB Created: 2021-10-02 11:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5ba6e79bbf77b0b6ef45df0d3c1c8cf4 SHA-1: e1f9b5a2311f9ddfb61aa842fbebe3707118f3cb SHA-256: 665e1a0ab5d78c5a7cb97e8fda94df589d3719b6f534b7df7c20866385a5fd7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://queure.ru/uplcv?utm_term=car+exhaust+popping+on+deceleration PDF link annotation
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/5332563851.pdfIn PDF document text
    • http://goldmustang.ru/files/files/65876647035.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/tejoburosejedado.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/57001560072.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/mizigorekunujawuke.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137216fa39ba---97201189159.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/ditegagejolimimexifilivaz.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/37682416000.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210903_065632.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/tagobokomegagedi.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/26170753559.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/bbd401079b53f630c37a02007fe98d01/salowifugegututuwujes.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/bebawinuko.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/fegipirivatixutig.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/79302012013.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/32828889594.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/fatanujuj.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/lugivosarusoxot.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/28966945845.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/pizebekegupebogiwute.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e2f6701a---zopanikegeni.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109162325246323.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/27e72c4db7dcc6e1884046fbdd0a3841/molopafosepawuxukiv.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/78283335452.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/30351131649.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/3980955426.pdfIn PDF document text
    • 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_off0000babf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABF 11024 bytes
SHA-256: 67616d2d2773b970e9ad8895ee92c288dbff8366f82b3732b96aa6cf383b5504
font_01_sfnt_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 17472 bytes
SHA-256: 11142ae87daae76d91dbb6235b01d9251005f7811346544f8b3287e2e7fec205
font_02_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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