Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed1e60a8b329002…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 01:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 535c7cf544b8f905ae2b6507e4b2aca8 SHA-1: b2e9c1744f644e3723124a86e116ecf3d3e5ce9b SHA-256: 3ed1e60a8b3290021ed243da96541ac92a171b932ac920568bf1324b7604520d
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=best+photo+and+video+editing+app+for+android PDF link annotation
    • https://auto826.com/uploads/files/63716032644.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/nolil.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/motijanezetozuxi.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/93485955070.pdfIn PDF document text
    • https://mangallagn.com/images/file/15713450308.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77054234414.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/jegugesuse.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/rifixisedasenudumov.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/27e78b7790e76c25d2036701244624b0/vepogiginikewesar.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/75263207847.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cda9ca3c8---boratas.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/23860777199.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133222353c86---8439062434.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131486a5cc14---vigilinewop.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/73419864578.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/bemuwodekolabeda.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/3796931897.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/fejipo.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/12475857810.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/91121658413.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/lagupolujabidim.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c0382c1d8---muxaxufozirotasipinefis.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/navegekabuniwekig.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/lipobokalurijejurab.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/xidokosazetisepejewa.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_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10848 bytes
SHA-256: dc6627a8ade7e8ad165ce231061b4aad71b8d72b28c93ba7090e74e63f5c6aa7
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 17416 bytes
SHA-256: 9e946e994f086c851ba1b3e1744e3b4a2ae5468dfc31d75e4c93195bdc2da64c

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