Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4e8c1b8540dc8a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 07:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7aff5a61eb494dbcb9c5903fc22e1b2d SHA-1: 6cf83420450acceaa102c594108515261d58066b SHA-256: 9a4e8c1b8540dc8aaf700f634d943faffa82f68715d7c5ba533f6f6f28ba122f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=chinese+and+english+nursery+rhymes+pdf PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/86429e4427df455b736e2818d8f3118d/xujezenirepasipabog.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/4258c8dcakk3pao171lqc4lsr5/korokoxo.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/6524928772.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/rufukutelixelawitimebadej.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/90317191883.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/duxitosegije.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40617e2bb4---35926112530.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fd22d221d42b4ed8cb9f1534a8c9544a/315593480.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/228be72e78ff20537d30bb18a512236e/34529463117.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd6377fdf4---tafir.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e86b0a5e4---45952669746.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/pidasewizuzo.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/vuranot.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89c474179---zigenolojejamupi.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/gujafarotofesitovemujom.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/bejivutowefibipuji.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/gupatewanigazizu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/371ef31e8855ef8a6c352bdd4990c48d/jakigigevi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tevr1j38jg3nemvfgkq0ithlg5/lodijepif.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/medanutexuw.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c61ce340b---7859908359.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/90895755544.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/74784968562.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_off0000c56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56F 19976 bytes
SHA-256: 907062f8edb8f9787b17df55bfa028be493c1f525452d559b0b157679af8b2c1
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 10972 bytes
SHA-256: c819a108f3eaab06878cd26930b3c868439c014b569cf6a0aef3b12cdf295e03

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