Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffa1a965acc2675…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 03:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d90eb623bebc03c8f8636362bbe3a69 SHA-1: 2adbcab8dc0ab7572bd82f9e8d83880e715b7985 SHA-256: 6ffa1a965acc2675415695a2feff0d5c7241153a26c6ae8e7e37832d3b24a6e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=nexus+7+windows+10+driver PDF link annotation
    • http://to-kajihan.net/js/upload/files/60088623765.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210901130553.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/nivenalizebenit.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41c040b92---wulezofixoxuzifo.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/lufikojito.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/rufox.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142950740789---bofakafinami.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/4965467387.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pojebigife.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/tekewapeloxawulalote.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/45639382619.pdfIn PDF document text
    • https://stvorki.ru/files/file/zenakeserijusoxemer.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/bosep.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/jesabemifebopatomogatumi.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/14267972789.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/mogekovegujokapederex.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcead0ef01---sosupejat.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98634061f---24050256533.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51800364164.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/zopubadowebofimaje.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/89635311637.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_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 10488 bytes
SHA-256: d73a74042cbc07ad7f615d738665aaf9d545e9c78b1e6b38b46822840a18cc1b
font_02_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 17368 bytes
SHA-256: a383712651b171e7c6e7f9aa7f54bd6407c283a7760e872d75d6eb2e183a7bc7

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