Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecae83f93f6dfaac…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 01:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f3df0d47b73ce99c530da6b65e3a7fc SHA-1: 0fa418d8ba2c694e32dc800804b3076c19bdbfb4 SHA-256: ecae83f93f6dfaac605b9eb7f1918d87f86d1980e8c1cab186011de92ae9165b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of link farms on compromised infrastructure suggests an attempt to obscure the ultimate destination and leverage potentially trusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6f5c22ccca---zinipubotivukogemi.pdf In PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/podizuzepekegafipixedij.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/dubasomirixewefewe.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081c533d45e4---70019956445.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/87687226250.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0c91d3d2e4c4290e27ed6abdd5a9e534/vatidivefexonugujo.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/71323815765.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/suzewalotakupeg.pdfIn PDF document text
    • https://bayramkaracabeton.com/images/Media/files/liwukebisefidotuvasol.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/39575b579d76b19be814fa22607497c7/zenagoxibaruv.pdfIn PDF document text
    • http://envigest.cz/upload/file/rebusivanufekofafoxog.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/23011923958.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210812_DC8DEB4500915918.pdfIn PDF document text
    • http://waypl.pl/upload/File/52752562610.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcd8948e3---tukazerifalerudivupitof.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61687fdeb---38272952204.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/5174983033.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/gekatamemoxaregotazum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=manual+silicone+breast+pump+how+to+usePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 16892 bytes
SHA-256: ad226dd8c3d60e15b862db4f97a3ff773e8b86f6c4cacb8f5c3c8e8623489024
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 10956 bytes
SHA-256: 5a117bb7f964e017644ce540945850c72f375d1029c54a62799d9cfa4052cf8e
font_02_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1