Malicious PDF — malware analysis report

Static analysis result for SHA-256 322b016f086ac675…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 01:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 30be420052d602d7dd5b693b8c1fdc91 SHA-1: cb9d1f85152fd2a060ee17d3dbae1c43c7e21a93 SHA-256: 322b016f086ac67574f41e288aa44ebb45e4b9f9d3ac180aa6b822029c109166
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable domains, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to trick users into downloading further payloads or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://xn--49s538bo8ux8c.net/userfiles/file/760150224.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095cf763ec96---goresedi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb791f7d366---miginorusovajupirena.pdfIn PDF document text
    • https://angkalaris.com/contents//files/84057429177.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e67244559---wogofeburujebajev.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6375f12f9b---35385149041.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/96079662645.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/90da1f9be781bab389507e766bebdcfa/guloxaz.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160845379e971e---89818482041.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wulakejomogisazikowixu.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/36251643779.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607292298ff50---seweditidebimabosoburi.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/54215193817.pdfIn PDF document text
    • http://chayka-svg.ru/files/59795153773.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/luboxiv.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ojue6h9agfo6b3cb00vfj4p3fa/94170914447.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078b13232e76---47269938940.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e6fd36c9b08f03b56633aa85bd4aa785/48306372864.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/porid.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/57449167423.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1b9571d6a32bce157201cc6b46153b84/gurebowunazemexotut.pdfIn PDF document text
    • http://dzbnf.com/upload/file///guzodegilawekex.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6d9a153e5a7833af1e25bb2fba9e61b6/turaraxebu.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/16425400766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=order+of+draw+stop+light+redPDF 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_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 10784 bytes
SHA-256: df17edad9611d413f634e203bf28d011722f8d8ae9e251b48aa68526b11e456b
font_01_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 17056 bytes
SHA-256: 9304900ce2f8c5c35845f82fed3d766d49e0bbc9450f8dfd3c55ec0c40317fec
font_02_sfnt_off00014dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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