Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe9735029ae4481…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 04:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 14110ad64fc31f1165e857fa9bb08142 SHA-1: f77bfb89eba62a00d6d67098f7f005923aea49af SHA-256: fbe9735029ae448115eecf7f5dd45cd4acd636e09b64afe6de5df1b85dd47586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://brincandoeaprendendo.com/fotosempresa/files/27800736656.pdf In PDF document text
    • http://kesherisrael.com/uploadEditor/files/dopuwezunezivawejatoxu.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/32902567052.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/56060309266.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///golanimoziki.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dhr7sheojpabh3ki88qln36sh9/gepilamanofegat.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/96281134145.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/90198216587.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/magoz.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/73832093656.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/67646718744.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/betuzojiz.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/26162775282.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/gidanaxaxabuparagitozobi.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/sikoxowikuwupudiv.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/38834669758.pdfIn PDF document text
    • http://c-six.it/userfiles/files/voxavot.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145966341f00---wijejoxulabulixegax.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4ecbb12b---21795018010.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/40510540467.pdfIn PDF document text
    • http://altus.pl/userfiles/file/80013483087.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/sojowuvularorumufade.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab5e3b7897---mulujet.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/wegizede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rk+sinha+translation+book+pdf+free+downloadPDF 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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 16464 bytes
SHA-256: 99cf82093d680d417ea5b57d0872449e1d8da2dcc2a54d3147e72aea8d6595ef
font_01_sfnt_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 10956 bytes
SHA-256: 95398d50bbf65baa6c19f4dc0015a191af4c17dc8071db1d8d3e7961dfbebf48
font_02_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1