Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d5a4199c0d24d…

MALICIOUS

PDF

78.8 KB Created: 2021-08-21 01:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49acb9afb1876ad51a2463850ec0ff01 SHA-1: eb36bb12ee3096313d6ee6c1d95ec12d4ce3fb07 SHA-256: 924d5a4199c0d24d8cf0bec150e91b542dddb211bb9dad65bb3943d4db71044e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document that contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. Heuristics indicate a lure to install browser extensions or updates, a common tactic for credential theft or malware delivery. The embedded JavaScript likely facilitates the redirection or download of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b8484bafc---gosojekabexavudewomuja.pdf In PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/4d4h1kolha8fi4d7g585606ieo/xatozof.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f99f0646ddcb5b86122fce6ace609e9b/8440030706.pdfIn PDF document text
    • http://kbchina.de/upload/zuvas.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a332128cfe---10331589519.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/73506868158.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/18941019424.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sexedijere.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71867692946.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/gametavevef.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/3173722797.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ab27c8b9746c7d45688e3c4e7d25f122/41018851386.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/vosekagafuzevabam.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/penuxadalijovuwukerevofit.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051007182773499.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/zaxejepedefememepuvimon.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/19850331160.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d8k35tc8n8a72nt0c7i3lircv6/70720506826.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/natefedapedegiwukuxog.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/ae96be28bc404ab8f4a59f547e08ac55/gerafetewixifolaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kahoot+hack+answersPDF 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_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 10360 bytes
SHA-256: 5e4c09b9ed765c8ec6010996f9b033a3eae6d9f4df657623ed8f12c24a58c2e4
font_02_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 17880 bytes
SHA-256: 06801b94d83f7fa6dd0e60c218767e91dd4fcaee7bf84e5e686614d799891728

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