Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce923339aa4bd2c…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 04:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34e664639d09e12ac53f58f5e20ae021 SHA-1: 4581b7748371e76047d4586ee893c1291c0c49ad SHA-256: fce923339aa4bd2cd622261fd3c7485c3de24a43802eb741c7daa78e2ad98cba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed for SEO manipulation or to host phishing content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rosabaum.de/web/editor/files/61114725832.pdf In PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7e964e603---70521975600.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/67961786528.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/86857594736.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/xuzibobojemig.pdfIn PDF document text
    • https://schmitz.cz/res/file/42147902694.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/12964855591.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2414b3b5b723540de88249877d9956b1/91938347805.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/48402893908.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/konidurasazizasazipo.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/fasuwibetuxujiwuru.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/gizosi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c057e19e7---39784404021.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/4784650848.pdfIn PDF document text
    • http://northcity.rs/slike/files/6207199607.pdfIn PDF document text
    • http://indecomavo.pl/inc/10520545489.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/feninasotiwawu.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/3c00d351ca70b58775cdd445110906e9/61264822118.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/67133446902.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/matevaxudosimotedag.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/l7v07mv45h4adijit6uf174eu7/84962651341.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/57949289782.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01eacab96---35776686116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=xanathar%27s+guide+to+everything+cavalierPDF 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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10972 bytes
SHA-256: 54d05a47dc6f2a4fa3aa016c66ddd1610753f1907b212adbfe81bd4750d68b98
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 18448 bytes
SHA-256: b9f0f0ea18a43e3b37ea06679ac13492bb6ce6f7123701f8250b8480d1941923

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