Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2fd5c1900fc8a5…

MALICIOUS

PDF

63.5 KB Created: 2021-08-17 18:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4739943fcc816be2f36b1a16c207bb38 SHA-1: b83b63015e03082401f247f385bc58f7ab4c5831 SHA-256: 8a2fd5c1900fc8a5abf40d057c206c7b80646f398976e4cc0201e216d1d903da
154 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9033

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 http://xn--b1akwe.xn--p1ai/userfiles/file/90086212486.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16111ee7000eaf---dizixav.pdf
    • http://kopdesign.nl/userfiles/file/4069312117.pdf
    • http://goozzl.com/userfiles/files/famapupufivuza.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2765e7ff3---bolabibugejes.pdf
    • http://intproplaw.com/admin/uploads/file/40619916761.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f090093e8ef---biserikebipudixog.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/66233742365.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/40076213054.pdf
    • http://thainightjob.com/ckfinder/userfiles/files/42890139878.pdf
    • http://sdds.be/userfiles/file/70127184631.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/wixelap.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/mv7mmog9m2gahddf6vql0mafh3/tenomirajid.pdf
    • http://koreaseowon.com/ckupload/files/9071887824.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160739243e9221---nowotigi.pdf
    • http://qtjdb.com/UploadFile/2021/07/25/file/20210725_093451_159.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607221cf9d567---giwukazakenoma.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f8cf5b6296f192298e5d621fd3c51ffc/66921842409.pdf
    • https://ctsgroups.asia/images/file/21570470735.pdf
    • https://karolinanowak.com/userfiles/file/zutubagolabexixozenibar.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/eemjjdbktcslpprd7e4e2eaqn0/popedi.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/7018570817.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/linedife.pdf
    • https://mertlakustika.cz/images/pages/file/sogofisebudex.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5546c904b---93349199098.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+5x8+index+card+template+google+docs

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