Malicious PDF — malware analysis report

Static analysis result for SHA-256 98271b3a9cdac0b7…

MALICIOUS

PDF

54.7 KB Created: 2021-09-24 19:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 37fd15a84d9c36907864ba2d171a2e61 SHA-1: 65d3bc0c01fe5b7a3bac42efddc99c7ef15ff7f4 SHA-256: 98271b3a9cdac0b788cc708ae18bd37b29a9caa48a90c5f85594e8d44cd98281
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious classification, likely due to the nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8248

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://garglob.ru/uplcv?utm_term=minecraft+1.10+0+apk PDF link annotation
    • https://conrays.ru/f/data/14904086415.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/wuzozuwiwoganuvusorox.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/xesumusir.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31a9b22be---28781682653.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/nulilebukuzujut.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/94019160147.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/ninujarapuxefubokajelaxo.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/dulukuloli.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/xufovuniforuja.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/febunajodukifik.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/53872156895.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/64245484970.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/defobefovigawobo.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/doleluxedonelobuvodalan.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/912afac846e2780b347e3383aa61ace2/godaso.pdfIn PDF document text
    • http://www.socfertenviron.org/cmsfile/contentfiles/lisuku.pdfIn PDF document text
    • https://lecachet.fr/docs/files/40183636922.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/sf0q3sjnj2lo4gspgjads6btg4/36717870212.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/vamusomogewagegol.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/61834326829.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/73d6b7f8786034e2520ab3be6ddcb414/10168267832.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/tiwudesasevofa.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/57622445856.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_off0000b127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB127 10464 bytes
SHA-256: 6e7e48214a287820713659490693d078b3255bc418281100c17e7ee0ed4dec8a

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