Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58aef982f9eb421…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 18:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfc2f2bde644c4c620c4923feb22c9ff SHA-1: af66d99180afccd1b510ba17b7502fa73e23f08a SHA-256: f58aef982f9eb4215ec846424633c18ddbba993253e8d6809056b54292e96cc9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious payloads. Several heuristics indicate the document is part of a link farm, pointing to compromised websites, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5559

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=the+hidden+life+of+trees+book+pdf PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387d526a2d4---92196700427.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/32101879345.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/24979785391.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9d72c53d---43291889827.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/lores.pdfIn PDF document text
    • https://denimder.org/resimler/files/ratiruzorebaz.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/gipemenavudinerirafageri.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/vubijavi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fd2dbf5e715d3da15297268cafa5fe0f/koposonizoseboje.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/59963901262.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/93542525764.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jusapexujudesofuzite.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/89152634341.pdfIn PDF document text
    • http://modern-pro.ru/files/file/razupumawamaxe.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/41330667940.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/28828147668.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/lulutepituro.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/veniwawuxoxagujuj.pdfIn PDF document text
    • http://mp-journal.com/media/file/1922033947.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/17858923964.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/30330458283.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/60189675593.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///bodozubewin.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210909/16311889694654.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_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 10628 bytes
SHA-256: d1174b328d7507efef3285b8dff8acf63a6484639c9956365424c69dbf6d1fcb

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