Malicious PDF — malware analysis report

Static analysis result for SHA-256 8539a991bde436b2…

MALICIOUS

PDF

64.0 KB Created: 2021-09-16 10:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5b2b9421365ed8a690e63d027c6267a6 SHA-1: ce288f03263d3d5366cc696ed9aec53ae6c4b9f2 SHA-256: 8539a991bde436b2f71f77628ee2de4d0764334544a52005b9d1876129553258
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6381

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://irlanc.ru/uplcv?utm_term=how+to+unlock+android+device+without+google+account PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358e835f925---23293373633.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/sadit.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/jamedanavudepejadekedi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/85193735147.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/fotufubefufukozazaniguga.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/borexivamunefidil.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202198_31011_857.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/wikisoxisusugugox.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/menopovujaderazibijixuxan.pdfIn PDF document text
    • http://konberdbio.com/upload/files/53161657536.pdfIn PDF document text
    • http://stylekd.ru/files/vezoz.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/kewesusojuwikekavelor.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b6ea63a0---voxelapirosetomuxo.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/59504132021.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/28212848335.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a525d717d---44906484461.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/87245439142.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/58609138890.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/diposapulufake.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/39526234512.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/4092152058.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d7794e76c94707fe7a4c640636d8d6ac/zevazezuzota.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/vifadojibuwurogigonelis.pdfIn PDF document text
    • http://mextro.de/upload/files/davolizukanaromovaregiso.pdfIn PDF document text

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