Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c78bbbaa6daab2a…

MALICIOUS

PDF

56.8 KB Created: 2021-09-01 14:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2644a94fb52330d33f7875537e7f0fdc SHA-1: 0cf666e786e8c7813db72cc32842572eebf422d1 SHA-256: 7c78bbbaa6daab2a352c43b989056cf8e5bc8a4dbfd0ccb7979da7979e39e83e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9387

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://noelex22.org/userfiles/file/momifenaveminiv.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609215a008542---zepudutavugesozazimiwuxos.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/36204343929.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/bilonev.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e358e3b9c7---1786036140.pdfIn PDF document text
    • http://toroisg.com/public/images/files/fasefadiga.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c12472db0c5---rajesiroweg.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/98384666378.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be465bd3128---kisamifolek.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/dojozeneliba.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fdba7d1eba31fce7597b531ddda6c1bd/ladepusijabupetazos.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/zosodofoxeneforezat.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fdd2642f86adce1d50074ec4847f63ec/54641281795.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/midemipexiniput.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/29293235220.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/26199345015.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/topofetikamojumirowiti.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/85518528736.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/sugexefivemusur.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/wezizidivuru.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5323e612---30004029727.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1d3983db---kalaraweleviragamodirif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+a+fast+horse+in+minecraftPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/07df840106bfe6c3b2c8d007459ebd18/sedojedidusabukaxuzirese.pdfIn PDF document text

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