Malicious PDF — malware analysis report

Static analysis result for SHA-256 45583f9457e1a303…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 19:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 662b5ade689edb7805ccb5091b1af4b2 SHA-1: 4642697f0bdc9e6621b1543688fd7c8b4ac439d0 SHA-256: 45583f9457e1a303ed44943a9f2dde80d5a6db538b0036d620dad71f82511f21
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://allytemp.ru/uplcv?utm_term=notepad+apk+download+for+pc+windows+10 PDF link annotation
    • https://phukienbep.net/media/files/74778965423.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/lutilanux.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/16428859533.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/83190404880.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/fikivajit.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/60251105515.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qlfucalqpc0p17vtv7le7p3s6q/wexojijajob.pdfIn PDF document text
    • https://trexanh.net/upload/files/75846655165.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613010d32824a---33164934732.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/62981054464.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/80103756200.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/67954103780.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zefobaxafevevu.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/3257865258.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/039e52881a2f3d91df52aa9557c64898/jobefitojuxopadafe.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/55192982651.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd4f46510e---xetaba.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/rulanulubazigegimav.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/wofedixoxubunape.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/86863921812.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/fokasebaf.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/76731495704.pdfIn PDF document text
    • https://renetravel.ro/images/files/62828152700.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e98220a9a4bdd889fc97fd07b2d08e3d/nubadotidowetididudomebag.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/lomofisefofopum.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_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10944 bytes
SHA-256: a48d9d661b4fed4d90f078b3c4a32eb693f2d5cd73e1b0895edc7e4ccf4ced85
font_02_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 18156 bytes
SHA-256: 6edddddc54dccc372dbde2c3702562c9e30e86774c5b9705c53066081c3c0701

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