Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d6ce96e46c0b0c…

MALICIOUS

PDF

78.1 KB Created: 2021-07-30 09:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: bfbb91aa7d15738ff8752d8980014597 SHA-1: c1f85707ee6c37ee6b83a10419272a9f61814a7b SHA-256: 40d6ce96e46c0b0c96671074b17c8bd96a2ba49ff23db186576c8d0459c85ad8
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2691

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://archism.ru/uplcv?utm_term=how+do+you+fix+a+sloan+flushmate+toilet PDF link annotation
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/336b31306ca9723e811e63f12199dabf/99130327362.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/fubixoto.pdfIn PDF document text
    • http://waterreducer.cn/d/files/43516124400.pdfIn PDF document text
    • http://bdn10.cz/files/file/vilapimanitakiwibim.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cfd94da65---18347867041.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/712ppm3mv67umjk91q9ibf73qm/balirazuwukofexixuxuxe.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955a72a63b---sekesonibugagagunubumeru.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/mubulezima.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/bulobulutiroponopew.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/peponujilezitutasake.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/55470813021.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e4a2ef85---95837858822.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb147a573c---63105204168.pdfIn PDF document text
    • http://domainecomps.com/documents/files/tigenavagazodifakalebo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5c341cb671ed3d74b99c9f07c0924c21/67168739420.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ohk8tsllnlg666jfq00396f3pl/40785618036.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/57db8834325561e05eefc76e2ed98574/fanigedov.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/50936442796.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05592a467a---83770222885.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0325ff7875573376b9066f64f30ead77/tuvobexuliboz.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c6a82f81---48964228910.pdfIn PDF document text
    • http://ailizia.com/userfiles/86038266703.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/93252689497.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c3a9c08c1---16548263862.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/70sladlbt82976regp6k6bj6t0/27323972288.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/87088120020.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/bosukowidipegaxijenin.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16664 bytes
SHA-256: 5304e29242b574794c4b017a8751ecc72ba683693895c931b49b9a60d4e3920c
font_01_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1