Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f63555c1bf488b…

MALICIOUS

PDF

50.1 KB Created: 2021-09-15 09:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4bb6c956e5af6d4969f267fbf3ac2055 SHA-1: 86f664f77e4d05405b014a28fce1d45595621074 SHA-256: b8f63555c1bf488b2a3de77c06abbeaa4f73158d321311cd063ee99b8324cad8
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5892

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67fd4a716---lasivovafuwupif.pdf In PDF document text
    • http://onsijsselstein.nl/userfiles/files/24601596243.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/85745977544.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/eff158c5990e1b9159d79d1e398f329b/wozitomobujatadaveloxolov.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edcbf3776a---zugoxevokol.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/49622053412.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/bunozo.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/86252684149.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/81889995602.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/xuxorobimube.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/25831500163.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/2052159818.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/29595456353.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/29740549700.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210910191056.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c222ec3880---197144570.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/rubanidatizijub.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/60538133598.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/12277027502.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/zigopawetejuzi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140f459ea575---jirewekexijigizikomunuw.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/kenokezuxukozufirofut.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613171fb3ffe4---muzomawaxepelase.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/8779260992.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/59813274672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dynamic+listview+with+checkbox+in+androidPDF link annotation

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