Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0866d520010278…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 01:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5129a601092164322914a4db6c8cd64 SHA-1: de6ecad5e491392067abb762b1c68dfed4fe7f4e SHA-256: 6d0866d520010278ef5bdb7717347becf179da983cca419fed5204a5f5a23de1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=asees+full+movie+download+720p+online PDF link annotation
    • http://www.aportecnica.com/imagenes/editor/file/katuvivot.pdfIn PDF document text
    • http://elpijisystem.com/file/71034215791.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/72445838444.pdfIn PDF document text
    • http://blccy.com/userfiles/files/lidolivebomuserarijufozox.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/32179378929.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/1762399787.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/60408081387.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/95902799047.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613745b846527---89636981581.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/jovusujo.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5366e5eb8264dd7843acae15a7682183/94965937684.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/xufoxowadolifiwuvu.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/xesufimigafum.pdfIn PDF document text
    • http://www.bandungmesin.com/file/luxebeginafodulipugiwa.pdfIn PDF document text
    • https://pecintajp.com/contents/files/ziluforuragirorigewero.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/47213644435.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/63968989386.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/30626166363.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/90258694133.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/91240069239.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/senarijimunasovugedeko.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/97261922393.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/24718616546.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/80922244788.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/db56549d50ac3a8ebc057c2b06820a32/tupokaboxe.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_off0000c82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82C 10988 bytes
SHA-256: f0914687a1508e60280e71ff3ead2475dfd7124ce08ccf684e6868ce63d64cfc
font_01_sfnt_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 17928 bytes
SHA-256: 0e9156b2b548d83bf73462b717531167bfcb0e072bff4efb211788aa646ab0c9
font_02_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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