Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2b0a4b151b61e4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 13:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a788212427e6bd8e43dba9c3cfd1b59c SHA-1: 23a00af83f2624b5cbcba032a3d7180e18312424 SHA-256: cb2b0a4b151b61e48a10f166aa0a6c824b2b16f1ef475a6eeb1ebaf371ec31e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download pages. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=le+cercle+trigonom%C3%A9trique+pdf PDF link annotation
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/46576210511.pdfIn PDF document text
    • http://mylodge-naoshima.com/68541575910.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/bitotowimojifubomod.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a69a8fc4360---49873921846.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee833039062---15557854193.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/52594879503.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/72929652742.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610f34ac3230f---2075191158.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/xisudopilexizutinu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa785c2d06b---viwotisuzizumofubek.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884a5821fa---77176049950.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/22065741478.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/digagolulozobilokux.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/pedumurozan.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/59150669146.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/kasajerinelev.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/witudilamatov.pdfIn PDF document text
    • http://strap.sk/uploads/files/94520885519.pdfIn PDF document text
    • http://vodnik48.ru/content/file/nuxamanujupe.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/fujozinu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d323dffc---lijolezexokilepi.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/97102199512.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f46e593ff48---41592629256.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/matiwutagafatisolutet.pdfIn PDF document text
    • https://digireg.cz/upload/24748082099.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3543236f594c095343ecb8c4735099fd/muvebebasaxapaxufu.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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 20164 bytes
SHA-256: 516de22b183a7fb021fb965dc478c877ff77dcd77b14d754c4ac263d55bc86e9
font_01_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 10988 bytes
SHA-256: ec1b53305c7512d9ed483abe752e6e2d6c7ce29979744168179cc0b2cff8d3e9
font_02_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1