Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6d943d537acfb9…

MALICIOUS

PDF

55.4 KB Created: 2021-10-04 14:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c986d6ff4d6b9b383c5b59477d55f60 SHA-1: 4188e677aebf1eb1b67778332c3c0fac96806e1f SHA-256: 3b6d943d537acfb9879ffa934907a5f56d80d168b5bc976c7aa75e9ed25474dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6241

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://medvor.ru/uplcv?utm_term=resident+evil+4+wii+edition+cheats PDF link annotation
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/7102927716.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/29159729711.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/53737711555.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/36286503409.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/64059492047.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/16353550289.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16131949ee6817---ziwar.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/1397713841.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/gejumagap.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141bf046c880---21175701514.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/59166860129.pdfIn PDF document text
    • https://jin-ji.com/upload/files/97396393810.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/bowetifikol.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/ganofebu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8b3814da7---pefopenunogadisodaxolev.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/ladijedazeruxebasosoj.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba6e6712c---bogesuxozafapalevikesovo.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/85561773417.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/61585344213.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/93322804390.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/gitejosefapamotuxuma.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/86014422440.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/86843854695.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/81791565414.pdfIn PDF document text

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