Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20eb13d9d857479…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 20:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f70dbbb3c9ed6c2cd07332660cf1c94b SHA-1: cb82a5ead6bed180a1af5baf99d237a8fef1b2eb SHA-256: d20eb13d9d8574794bb66636ab63e3f1aa1bd99152b4944daf3ef95ed85f9cb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on potentially untrusted domains, suggesting an attempt to manipulate search results or distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.puhito.hu/uploads/38841915065.pdf In PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613e07309f3f9.pdfIn PDF document text
    • https://forssh.com/userfiles/file/timukuditivopodugib.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/jotabusopekomigonorejo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131087acc90e---62578411363.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/30706150418.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/11641101886.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/pepewodenob.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/92801378776.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b9c7e1c1552db12f8861c5637db7d78b/52657780491.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/69599830508.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/golivorigi.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/naxove.pdfIn PDF document text
    • https://bliznacite.com/files/gexepugavofegexiwute.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/xedevutito.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/99f9175b4cf579c8575e0aaf1df36128/43965076424.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/43793911936.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/lizupovevoleguwob.pdfIn PDF document text
    • http://totoumi.jp/upload/file/30810635713.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/fupugadoladilatajifexu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d488c7e233c2fd8716730795ed0eb1cc/nejeluwogev.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/94079926497.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/dewabatiginiwidorabudajib.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c939a9a1ac2483b42754c0ee94c42f34/19561427719.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qojavs19ig7ltpruu6pp8tdsm1/lajifujufabaxuz.pdfIn PDF document text
    • http://sakra.sk/storage/file/juwirudabazunetolixuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=la+isla+del+tesoro+pdfPDF 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_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 18540 bytes
SHA-256: 32bede0c2b8e5c26460eaec9519b3c156d14f41c46a4df95db19f7d7857a57a8
font_01_sfnt_off00010104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10104 10344 bytes
SHA-256: 0862f1422a27b7c159741fe48a6ea10f0fe4a1bb13b865fb728c72c2f82bbd64
font_02_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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