Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0ebb4eb66da857…

MALICIOUS

PDF

87.9 KB Created: 2021-09-03 04:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba2e925717acf9cfd460bd93f0ff587c SHA-1: 7ceda2daa9c779d513fec3602fd7585f5a8f3429 SHA-256: 6b0ebb4eb66da857c67e7f7415add5b2387109bbd7b8bbb36e78d89783ff4a9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on disposable domains and compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=maharera+act+2019+pdf PDF link annotation
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d356dcbd2---jefuzubeguwagulinuj.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/pigosune.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/36700304916.pdfIn PDF document text
    • http://learningkey.org/userfiles/nobow.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2d07db9d5f142beba24232bbcdf50f19/wisoxadonag.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/50230341357.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/dolafabebapu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5b7a46b9e6220e6f2f563afa20e4111c/25038228350.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0b7f201b---jesudu.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/rusesamekadikikanixori.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6922adc0---misuwikopafixexiki.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/gonukanumurojusamova.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2ceda9eb---gadiwuvotovewubimu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/givadixutubafenakaxufuk.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/14063793678.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/saxuzowetetusegixafatopi.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bd02752ec8fbdc45b5a18832cadabaab/votutozutodod.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41f2b61fc---maxuredadevogoj.pdfIn PDF document text
    • http://allasclub.com/campannas/file/simovaterulixogadokaz.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/27128357494.pdfIn PDF document text
    • http://praguetransfer.com/files/file/32908595645.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/27lpqfcnlvil57guas5im9kjfh/xokaziwekogonanugu.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/fisarojov.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/fefazakepowapodulilefofig.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d74da7fb---wovokuxofaloronoruwazalik.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3e1a2cdc7331ab87b6ea0fad8939c1e6/xezadomelibigi.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_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 17580 bytes
SHA-256: d53565e3da9351f4bb9446428b9da6c3da5400a320148ee249371813ab926a9c
font_01_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 10644 bytes
SHA-256: 2d76e89809d89f152cbc1b089eea6e9644b902dde4f4ab7725657c78174d810d
font_02_sfnt_off000139e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1