Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99d991de78b15a2…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 01:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28b1c75a93d1b3195c30f79abcc7fe9e SHA-1: ee08a31cd45614c7d212d92b687ed9e15353d020 SHA-256: d99d991de78b15a279040bc0944ccd70a33e6aaa4ffb90ed4af89b46adfe62ae
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload storage or disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update. This, combined with the embedded JavaScript, suggests a social engineering attack aimed at tricking the user into downloading and executing malicious content or revealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=minecraft+free+games+to+play PDF link annotation
    • http://bunny888.com/ckfinder/userfiles/files/66116095754.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/derepugovol.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zesazo.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/mufesaregabujopuja.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/favanodotumimaxonolo.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/1094190810.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/kegizapujewapelawa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39dd52e11---4310427563.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/zopetopujufoduwupotol.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/bebivokafogogepan.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/xenokabetalutel.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/97781422003.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/lorepusol.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/xiberijulafijitetejo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-3/20210903195701801264.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/dujenudos.pdfIn PDF document text
    • https://rjpexport.com/files/32752015581.pdfIn PDF document text
    • http://plise.org/userfiles/file/19718719820.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/58652775387.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8d149107a9cee6451985d134a8cfb887/90818037063.pdfIn PDF document text
    • http://mimpishio1.com/contents/files/soguvolo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700b473020---61484993480.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/44815264105.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/limitivikax.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/27520968154.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_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 10932 bytes
SHA-256: 74b776c09b4815bb9193c9974d83be917621cab9c2d98de2a674aec577922814
font_01_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 18912 bytes
SHA-256: 66251d94b070bb68ccdaca3a6d3d23184fa38c306c77cc1ecf414ac2160da116
font_02_sfnt_off000128e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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