Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d7d4cab0197987…

MALICIOUS

PDF

56.8 KB Created: 2021-10-01 10:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bc6cc61f15c3af96d132d234a792cbe SHA-1: d353ec9a8aa5d68361ba221ef1c9228b5929d31a SHA-256: d1d7d4cab0197987b7a75829bfde415fa1dcf3d08ef6c7a626708ebbc7baaa19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link distribution. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6398

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://progfin.pl/userfiles/file/34911181498.pdf In PDF document text
    • https://hohsingfiber.com/ufiles/files/50233250706.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/45303292443.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c4a5cc84---38819905066.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/domonolemiguwetenet.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vepinovobumopogazikaso.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/17834093147.pdfIn PDF document text
    • http://strandedtattoo.info/file/64009092931.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615650473339f---32844332697.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/17801411585.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/27459523897.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf08d17233---25365233249.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/zovufolevofadijapekir.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/nurifiwapirunewin.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jutafakigavatenojisula.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/bixab.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/96236425546.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/fipivan.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/77907159666.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/63921476429.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f61d6d20---22182489474.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/42040489569.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/82108934885.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/nenak.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/63967771037.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/vavadokigotixujet.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/13931891747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=unconventional+art+mediumsPDF link annotation
    • 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_off0000bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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