Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcfb344f6be5b51…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 02:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57d38cb68c6b4f1b6de517d7610a531d SHA-1: 89230d06f5a5627ea29381e4172ba454e3b05dc4 SHA-256: ebcfb344f6be5b512253793f3a0d93f2f23378af7939aee85f02f76738d30090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tubietelbar.hu/uploadfile/dizemareva.pdf In PDF document text
    • https://plagij.at/ckfinder/userfiles/files/winodejevutofo.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/29807514860.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/44722862825.pdfIn PDF document text
    • https://krusomying.com/data/file/toxarapedomu.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/gabidufobaxoderateluzafa.pdfIn PDF document text
    • http://home-plast.ru/foto/files/tafowatep.pdfIn PDF document text
    • http://cissi.it/userfiles/files/mabotokun.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/20800e8f74276d973f7d56308a483595/lovez.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/72287116337.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146f1f4f1973---jipasekubu.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/15531714899.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/88856035092.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/3129218596.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b2948bc01---9747162096.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396eab26e4e---76660553809.pdfIn PDF document text
    • http://glassick.com/userfiles/file/ruvefodupunupufaxomup.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tekabotorivu.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/siponupa.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210916142706536535.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/20074330051.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/22181234185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pes+2021+ps5+original+version+ppsspp+android+download+%26+play+gamePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c32f5c9ff---54011932408.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/giwajejisaxogefuxo.pdfIn PDF document text
    • 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_off0000b9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FA 11052 bytes
SHA-256: 6acd64c6ba0cd6160dfd932af82dc894ec514371d6fc55684bef564c7b787ee1
font_01_sfnt_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 16416 bytes
SHA-256: 3c8045b12309a7be7461dcd6f78d0e914a5b41bb53bc209a3230d05e7979cd5f
font_02_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1