Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54a4aec5ed86c5f…

MALICIOUS

PDF

45.2 KB Created: 2021-09-28 17:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4be4956743526d5621a773523bd4c16f SHA-1: 7b10e13f017b3785d9eeeb0183ab1451922b974b SHA-256: a54a4aec5ed86c5f99660d4d4629c764046241ff249d1d6a29f0f77a8e09b998
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7844

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://infrive.ru/uplcv?utm_term=create+minecraft+account+free PDF link annotation
    • http://coumert.com/images/file/42619420175.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/387f51c14be958afb31188fd95a3ba7e/79935862660.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/rabosumokesawimipe.pdfIn PDF document text
    • https://smilewax.tw/uploads/files/202109222027426709.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/56241842871.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/96883273591.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161427de9a9936---41357376274.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/dipelerag.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/zomudibev.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/fisizilewizotoxofutetezu.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/516252419.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8ee72230---goxevezezoxabuxakirab.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/lafalijobijitugamopu.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/sigovobidosewedimaruti.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xefavoxemowinozog.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/65836582209.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/65568470141.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/78600077015.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/davofajakipaf.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/suxusuxokadagabofufupeked.pdfIn PDF document text

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