Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb67ba66770920b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 00:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 699ffe2a4dab3b0db020517c8f468bb3 SHA-1: 0b865a85d9298adab744cbbcc154e97b44714106 SHA-256: 7cb67ba66770920b5490323afb758c545fc7dc0da69858ad473662016768297f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cructi.ru/uplcv?utm_term=lord+of+the+rings+female+orc PDF link annotation
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/24342583109.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/ribilebusaxuwezaxajisi.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/15340177957.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9374d310b---93499889392.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/latododotakopidinu.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/51601440535.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0d3395fbbc614975fb2aeb2e8d4394a9/siriteliwamivubuzakib.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vowuredulunivonapenakevom.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/lukax.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fda738d5bae---damid.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/giwabawosirewodomoberita.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/mneuli73ugi8c8itr1s96rfvo5/jamulegejilavi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2304bd7987---togetubajo.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210806002443.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/gikesunimijepawewesubolu.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/tukanafoxapikad.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077375bc2361---raroxetajarev.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e8e45448---sivura.pdfIn PDF document text
    • https://kuepancong.com/contents//files/lamaberemof.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/57807755563.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9epnl9oraq4fe47hu5ufjvpfko/pilevi.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a435d277262cec72c7c1d5e4ab3f8b7a/kedivowusoze.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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 10880 bytes
SHA-256: 04503cac2b0d32e563c53725e12759e416ffe59de8024abd9a84b9ab797cd405
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 18596 bytes
SHA-256: e1c3835c635ec1b4599485e0d3a700b289ef1c545ac64cc3deda51bd6d5fad3d
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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