Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6df601ab5c20e21…

MALICIOUS

PDF

93.6 KB Created: 2021-09-24 00:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4449f23be5bc09356c31721f00c3dd62 SHA-1: c5a528b6265d603367f3391d82e51b38489916d2 SHA-256: e6df601ab5c20e21e1fdbeef14271298dccbf2f217649c58cb1589580251a216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://jooli.ru/ckfinder/userfiles/files/89295291051.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d06873254ccb89768aced982f7048909/kuted.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142afd481e7a---68173072134.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/88924473288.pdfIn PDF document text
    • http://twilaw.com/files/files/gamunogironimutoxefa.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/88261599804.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/judujevanitakor.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/roteputejegelelunixu.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/kifepuvimiv.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137a92c70db4---32287637896.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/92156962203.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/sigesi.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/peripijiwuvefapuwesipo.pdfIn PDF document text
    • https://felicityokolo.com/file/83356094573.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/ximevuvij.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/33174393314.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/7790181713.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc0c70e4c4---susatopizisubiroja.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/5952575316.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/42437961986.pdfIn PDF document text
    • http://halanmilk.com/upload/files/89935251541.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/47181423999.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/pefotironipato.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/xojilefafokuxe.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/26697068073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=you+to+me+are+everything+full+movie+123moviesPDF 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_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 11268 bytes
SHA-256: d8a8fedc52465beefe23c7afcf0b498d9768e00dcc6c3848d7e515585ea68b1f
font_01_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE3 17228 bytes
SHA-256: 054e15310867f1eb04cec070fb3ed1bb86260c5cd997b1bbd0cb2b03c371eda7