Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94f05ea0de60229…

MALICIOUS

PDF

63.7 KB Created: 2021-10-01 03:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ca9198e7104543a8c551341fbae13295 SHA-1: b1272418a5f21bc07b6f2ccdb541ceb54b778641 SHA-256: b94f05ea0de60229470fd76d7f167851bea01bdb8832245b6f4e20b4716cbc7d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier also flagged the PDF as malicious. This suggests the document is designed to redirect users to potentially malicious or SEO-manipulated content, possibly as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5956

Heuristics 4

  • 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://konzolstudio.ro/uploaded_files/file/9492551461.pdf In PDF document text
    • http://myphamso1.net/uploads/files/65814296566.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/mukidevufa.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b880b6910730cb6b7d46e7a44d4845ab/baloripemigafaw.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161562cf943373---bixuwewufaz.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/jofenomarapososabu.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/doxoromoped.pdfIn PDF document text
    • http://getem.eu/files/file/91039189709.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/54520630120.pdfIn PDF document text
    • http://fitviewer.info/files/file/tifezikejedupoxuka.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/fuwabe.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/betexukorekoba.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/lujogawasowidojenekubuxo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/330be24366397e5cab49a14f68d786f2/30439230537.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/wijew.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/fepogorutude.pdfIn PDF document text
    • https://grnca.org/img/files/files/50966860685.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/18606608521.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/33249980572.pdfIn PDF document text
    • https://fjhi.org/userfiles/file/fukamazino.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/1745653650.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7022e381f---31528667585.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/15908966264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cara+cheat+pubg+litePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AB 10532 bytes
SHA-256: 883d99ba19b32e84b2140fa8e60d736b7ca0e57cd8a47e4d4a8dc55eb1bb5574
font_01_sfnt_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 15624 bytes
SHA-256: d959f9b852a8ea5ce7d1e8028873639b16949f42aed0ede3b18f7910b63b0188

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