Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9083ad66a2bb12c…

MALICIOUS

PDF

73.5 KB Created: 2021-10-10 17:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6b081e0fc0f1d25b8e724092aed7977 SHA-1: e84262fb70646da52b00cdc44c63257b1009f40f SHA-256: a9083ad66a2bb12c1e13afdc4098c2e1b3afb26316424cd2127713ebdba89fb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/82283872468.pdf
    • http://mclarenquartz.in/ci/userfiles/files/zinuxurutubiwoxopolonawu.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/56136671296.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/bujituwik.pdf
    • https://indiansecuritisation.com/ckfinder/userfiles/files/67175593701.pdf
    • http://asvpp.fr/pdf/gofobupoxokezukozewipodil.pdf
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zifofapufirobogob.pdf
    • http://saveursetsavoirs.fr/image/file/taxazobuvelorugop.pdf
    • http://waypl.pl/upload/File/68337338225.pdf
    • http://studiodelcorso.eu/userfiles/files/robobugapagimujonom.pdf
    • https://maconlux.lu/userfiles/files/21987314987.pdf
    • http://chengzechem.com/upload/files/7479635418.pdf
    • http://dtmaso.com/public_html/Imagens/file/78200458695.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bdcfc556ca02a76e78408ec1fb7865d3/83045407325.pdf
    • http://soft-pro.hr/upload/datoteke/21476133990.pdf
    • http://abwingssuffolk2.com/uploads/files/setijetotojasuramu.pdf
    • https://vaynhanh365.net/contents/files/13933351668.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4efea61e849f290a8b6ba652880e03b8/nazax.pdf
    • http://myucpb.net/userfiles/file/18122822020.pdf
    • http://profiklub.sanswiss.cz/files/file/87797051459.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5337aa51e7d6980f460ab8752448b9d3/43501649895.pdf
    • http://www.mab-solutions.fr/upload/file/76434062037.pdf
    • http://asiadomainstore.com/userfiles/file/vugubowowekuv.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/lafopiroritoxixevogapinus.pdf
    • http://a1-automotivegroup.com/upload/files/84176654554.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rushikesh+dudhat+geography+optional+notes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b814.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB814 16792 bytes
font_01_sfnt_off0000d026.bin
b42ae6e825a00ef35be50f0a53b4627015bf1402fb463cd8e537a460d7580046
pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 17840 bytes
font_02_sfnt_off0000fef6.bin
30edcb4db27e4b6226f08ffa0d9d57c50086084a87983b7b30253fd59298830a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 11020 bytes