Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cba5010399022f…

MALICIOUS

PDF

98.5 KB Created: 2021-08-02 08:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b709c35e61c2bde0d250b19ef37a3a3d SHA-1: f990807b771ce8fbab77c0ca752f6b85c785cf05 SHA-256: 63cba5010399022f5c3f5efe9d692a3c18d8df40d86a4fe0e4a9455a3e884787
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into downloading an archive, possibly containing a further payload, by providing a password. No scripts were extracted, but the presence of multiple external links and the overall detection profile strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=unir+varios+documentos+en+un+solo+pdf+gratis PDF link annotation
    • https://securitydm.com/slicice/file/fulerufoledirepegaloreb.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/linafosozepawovadexoredi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f7bd175d8---90255479000.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/12253242154.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609879eaa0984---mobekobumeteja.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f18331074a1---putepawum.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/af759bf46ac5f6763bf2d46812095de0/74088922190.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/cb9e527129895222f0d67af273320bdf/66562927806.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/0nbi367r0c5lessrd0lpr45cf3/lurerutozegudutozuleduje.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/salax.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035922e4a2---67985141291.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/eb41d5b7dd44d96a95d19ca76a10e675/zerowozaloragogike.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700cf64d4de---pikidupavapinojuzeba.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/32354536672.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094209837b28---86507466023.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/musekegevodu.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/28940974867.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tf2lk5mbmm9q20jq3uv606tis1/79547597809.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bdrujrokjh2n9rkhqii7niu2b/10662807667.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075928cb0705---nibafomenuxumajefesal.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075f10455b5b---41232683687.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/37000757520.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/78671909829.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vugorirufuxunoxe.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_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 11136 bytes
SHA-256: 0a93b730abebd002039354dbe87dd1413616b2222b2af3ab8e4f97902d982c5d
font_01_sfnt_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BE 18444 bytes
SHA-256: e37d7edac9ae952406db22ed595d35907df979d5978444b847761403771e4e9e

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