Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e90af96ef96ce06…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 22:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: c2d51ae27da91cbf1e8dce0f71462f68 SHA-1: c51c11a3901f899ea70a506d922d34289f00191e SHA-256: 4e90af96ef96ce0639fe4c56c785fce64aea0ed3136f803523fbb2488b656aac
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which then redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://livre-d-art.com/ckfinder/userfiles/files/pesuforilesegivur.pdf In PDF document text
    • https://iphone-odklep.si/vsebina/83695745246.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/275f3878f1d091ee37b7ebe9ef9463fe/57650368779.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/kovovemapebukedo.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/lofoletujegeg.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/31751042947.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/11011302326.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/40021880228.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a63e0556b10a26a7f0185da3cb5ae3bd/32937403944.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614af47a60b88---paxof.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/roxelalolagidewejivuz.pdfIn PDF document text
    • https://clubon.top/uploads/files/papafuravolawoba.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/4343340410.pdfIn PDF document text
    • http://royalgroup.at/tmp/54475468345.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/13252944490.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31507032824.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/11570160881.pdfIn PDF document text
    • https://norservis.com/files/files/gadaxelikujivatenawoz.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/lutoguporukiridulena.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed858cc941---65607662946.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b62ba4979---xidetizodabalofoki.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4065be4086ad9fbbb3071ffbbcd8848d/78339994179.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/kejanutato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hill+climb+racing+2+hackedPDF 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_off0000b289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 10772 bytes
SHA-256: 7ec850101eabb0be11f7d7536c3c6abde600a4856c7d6f9d4ccde4929f5e1d5e
font_02_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 15424 bytes
SHA-256: 66d2198b943592986d58d2a0abfcb35f35f42b24f679fc7cb66b01da27992f94