Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6c14d460962503…

MALICIOUS

PDF

89.1 KB Created: 2021-09-15 21:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ea38e361350eafeecd035188a505d29 SHA-1: d4f045685cb98dca5bcac7000deae1be218551bc SHA-256: 4a6c14d460962503406acb6ba0aca064807feb126f495ff744a2117a0ee91dcb
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 of which point to compromised WordPress sites or disposable hosting. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing a browser extension or update. This, combined with the embedded JavaScript and link farm, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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 http://espacioschillout.es/images/admin/file/pejizi.pdf In PDF document text
    • http://cuoredicane.it/userfiles/files/31078531644.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vlfvvfonmu3i9ccqo3ttfbvaud/pawokirurejudigido.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/kivede.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/jagezaketimeresubejanolu.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/79411564452.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/16892171206.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/tizafaxigikigejojasita.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/revugatuzorup.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xurelixojotivo.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/89014264443.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1768978475612f94bdc5c50.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613335D2D77C3.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/kufumisiwewu.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/60311573082.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162dfc0959---zafalubomasefereda.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/jogaminisajap.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/7039780012.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/zuwunumosegamerejipipalog.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/17911378363.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/19686281048.pdfIn PDF document text
    • https://nasikampung.info/contents/files/7766822792.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qj6mf88iru5vdgo056mntq536u/mopadawobajuwawul.pdfIn PDF document text
    • https://scalper.ir/data/files/file/dewufupomojupamolusaka.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/bananugup.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mavunn0c9r4stequoujgh0ufos/39661577030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cool+text+generator+copy+pastePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 10704 bytes
SHA-256: 5db802cbd322dd31d01f9cfbc972f7cfd2ef76b5e9e4338fa72edf6371acbbe0
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 17136 bytes
SHA-256: 9ce58ebfdd0736078e01f61f0b8090dba9ecc27fbbbf7932060d7430f591268f
font_02_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 17152 bytes
SHA-256: faf51032b67ef8ae8ea6ede93b82b97f95ae4828d173becdd2d4b071308b9d54

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