Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8fe29e63256489…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 18:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcf6c0af8d3ec4d98afbfc4d2af1e4d7 SHA-1: 81613aea33709e9a5cd2064469c2e8344ce86100 SHA-256: db8fe29e63256489ae6e9bac3a09b9301e6c02b69169a0235f7bfc7d5c350f08
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, which are likely used to host further malicious content or redirect users to phishing pages. The ML classifier strongly indicates maliciousness, supporting the assessment of a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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://garglob.ru/uplcv?utm_term=the+very+hungry+caterpillar+life+cycle+worksheet PDF link annotation
    • http://velapower.com/glwh/UploadFile/file/2021072410113373499.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/xuxid.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/95907616545.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/28809441646.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/kewebopinoxuvodanivex.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083f73817ab0---bagozelirokidebujawufu.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/kisozawavironugavuremanit.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/zexapitoruwisiluvawevato.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/lafamebemomupewobapasad.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/lutotajefexomafolesupu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/db51bc6ce57425248498f1d2fa9f6064/kaxanuli.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01fcace47---teziwerelasowexakure.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/timarugekarixudiwitudat.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d139e42b5---23954987044.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b713d8ad14---jegokekarosibewo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d098aa7ee3---togakolononiwefefabul.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/tnh75c93g1gn6onbij773b8dff/50136622050.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f4f54811---81132665454.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/88421087158.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1627858843.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/56582698007.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_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 11180 bytes
SHA-256: 071e2cc0522edbd84fdddf22df12261a82e8baa9a5c49356e00ce9dbaf3b437f
font_02_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 17704 bytes
SHA-256: 81f924475e188f3ed3e8f185af36742d2acc3ee347d04e929a3eae63b37f354b

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