Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7675e2e30751c9c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 08:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51c209e7cf875e3e89f065e43a6a5031 SHA-1: 79cb9da848f8391000413a69451be29fa22dbbf9 SHA-256: c7675e2e30751c9c67b87f59d7dc63a6b4f911c3fbc705a571db2fc5d9686b35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=b+ed+entrance+exam+question+paper+with+answer+pdf PDF link annotation
    • https://fiscconsulting.com/userfiles/file/losabokuvaviwelatefev.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06cd76fc0---jipupededesozipu.pdfIn PDF document text
    • http://taociren.com/upload/file/210821071514140626ga3a8ata2ee2.pdfIn PDF document text
    • https://netlandschool.cl/files/93579649965.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/29815764774.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/97638557853.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/kipowojagotuxoxepaf.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e526518959---pidegul.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/sabojumufuxe.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/bagijanekirapedulam.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609439318f1d0---jinoveragaberulot.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2a13c9b372363d82dd9ed5dfa461a93a/72759468150.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076035896161---puxaxibikofufe.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/zadosiximag.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/85979778965.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/xijijinexijilom.pdfIn PDF document text
    • http://airfa.it/userfiles/file/80510485699.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/t7i08uotb7kgdc56vj0e0hufg3/bokubodo.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/86629963805.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dcceb2802239cf53d112a200bf9a3a6e/dizopejupevi.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/genen.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a269e87979f---ledodozej.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ji5cqo91ba50f59jcgeggqkdt2/94563189271.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/jifixokajoleduvunudozizix.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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 11324 bytes
SHA-256: bdbb4d3bf60b619276c6267bc47e752988e510ff1f34ff8d935ec609ce82f985
font_02_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 16748 bytes
SHA-256: f6fb4187f6bc3d4157a0772a69ab53a5148438e3581cb1dbd3230a903b1cfcda

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