Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdd4bdfcbac31e6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 19:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b2599a1148a5c1a4a7dfcd053f2b852 SHA-1: 413eacbeb157e9b4f06c56573db217149dce02ab SHA-256: 8fdd4bdfcbac31e662f6ff2d02629d0cb44fa7ce53626548041f897b4532c704
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension. The embedded JavaScript and external links are likely used to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=how+to+put+adblock+on+chrome+android PDF link annotation
    • https://luatsuavina.com/userfiles/file/riwukoxurapigigiwukutiz.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/nototumerejunov.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0aa3135a---37485175095.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/55820984271.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9fc7af0f560bd22c76bce2605fd75e06/36765584328.pdfIn PDF document text
    • http://ijfbn.com/editor_up/fitixilexam.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/jubijatikedeliv.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/tigojitexurew.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/mumituxubudofabepigus.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/87066090198.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/riridopevubazaja.pdfIn PDF document text
    • http://arucax.am/user_images/file/98094564571.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136021f481a0---91750912523.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/zumapitez.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/44224710981.pdfIn PDF document text
    • https://mavibusiness.it/file/47227999616.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/gamatizewekeroto.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/37361556056.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/c4tv47h7hn9c6q6u018qj8gki3/66317961302.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jufedilovajoratudu.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/lerelapiveviwiwatifeme.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee1e3fa4---xewurusibat.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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 17104 bytes
SHA-256: fc0ec2cb1efb6196b6bcafdde599366931a05063f0c20e0f8cb72d2499ce18b8
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 11020 bytes
SHA-256: b4b5b2e4aed1c375d67225c876cb5937a893ba21378394a2d944ad5ae1342e9a

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