Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4b7a34ca3c4f54…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 12:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c0e9d90ca5325c0f9a28b87cfa5c0acb SHA-1: 65b802bc6dd6286396270d34896a046bd1137945 SHA-256: ac4b7a34ca3c4f541a17eff51bc4ae746b01cee509ceab5e1887e006407dc470
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a mix of compromised CMS uploads and disposable hosting domains, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6148

Heuristics 5

  • 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
  • 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=cabinet+manual+bahamas PDF link annotation
    • https://7mark3t2-7aya.com/contents/files/18202312392.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/u3cror5bjahftqnf9e2d7phs3r/muvezigomabowanojuwavon.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rizixiwu.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/2092921619.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/41292397827.pdfIn PDF document text
    • https://service-panev.com/userfiles/bilipopamewonodekat.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/97017545666.pdfIn PDF document text
    • http://anninh247.info/upload/files/dararuzawivivojedifutuf.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/jipapinekajajanitodeda.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/85653360214.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b6f75826f---21709763718.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f371a30fd2---sulobuzezopazatewoneworo.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kabnq50cvdte7a50vs4vqaukr3/2446016175.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/kefinunofe.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/90989591583.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/28843615322.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235c93181af---wulimikuzuze.pdfIn PDF document text
    • http://klefmarken.se/upload/file/pudawemizo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vemotovuzukud.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bb4a68a4f947855640ad1551eebcb200/mobasorumal.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/p89ut756mtm3sp1hfj94kglnv5/56064691835.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5293ed49a---44154554767.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/19751788493.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jimapenuruliwojozorazota.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 18416 bytes
SHA-256: 8669b142feaa5a0613db1e253f7bd30e8908b90e2f7e0deb3a029c82f833c8dc

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