Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c3a0c7ea6c5eab…

MALICIOUS

PDF

92.5 KB Created: 2021-07-05 17:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df598cbf01a95ea8e553219632fce4d8 SHA-1: 8f55c41e28b97dc765190be031b7693b0fa43505 SHA-256: d5c3a0c7ea6c5eab5897cfe898a5d2888e48baafdd2f4a76d7889684892932f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of numerous external URIs indicates a likely intent to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://wastran.ru/uplcv?utm_term=the+reading+drummer+pdf PDF link annotation
    • https://makiriaszto.hu/ckfinder/userfiles/files/81346214602.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e8daa762---wibakidasopilila.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/kevewufik.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/51039952612.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/75520096417.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0b74df87---javedupumiluxarubaluda.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c554f6ac288---62957547664.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096715720a82---zonijorevepu.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a1c9ba37d0a01fc5539ae372918543ed/95355604477.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cf1e5utrh6oj9qhuh4u4j1uvd1/geketutozexi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13db25a47---40799800548.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b6784f5c5df82ac687f6cb15b1f78dc0/wewedoduzososugimopekunil.pdfIn PDF document text
    • http://web68s.com/upload/files/vejukipugajulif.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/77091501677.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b329ddd94bb---vejukesinibelatedogomegob.pdfIn PDF document text
    • http://bakoca.hu/files/file/80996737480.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/40778352261.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706fa582f04---31777121603.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdbb40e06a---94301262061.pdfIn PDF document text
    • http://salt17.com/userfiles/files/rukebe.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5us8rrqo5u1138g115omjncpce/nojomizod.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ca52b94a---lugumowiv.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8ad2a0c9a9409ace73d65c11cb33eab7/faxujuvoxusona.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210623184500683323.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b4c9fgb2or5a094asb3niv1m5t/bewesakisig.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_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 17340 bytes
SHA-256: 9f17632c1a4df3abb1cd8ae5695561d7d645b260e26ebcb68c24572a0edb1f55
font_01_sfnt_off00013547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13547 10576 bytes
SHA-256: f2d71843ebe7c15e8e83fb2687338b91ad5d25e3e03919b4ed8a7c21634ae602
font_02_sfnt_off00014ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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