Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46db11e2e049200…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 02:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d69f07f10c254bdb57cc5f42fc73b909 SHA-1: 7398a130ec0be19d3b8d15f4e566c55279cddba7 SHA-256: a46db11e2e0492002d9d9977d1090c186717c78e84345ae43e3a75a6e683c56e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm on disposable hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://www.funes.gob.ar/ckfinder/userfiles/files/96763208588.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/73918481083.pdfIn PDF document text
    • http://didopack.com/files/29670417393.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/patoserikiwakugegimovowux.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/bobememuniwiroriva.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2d10d4c3---vawiwaselol.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/12094188066.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/pizotababatoxudomadozoxug.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/deparamigimogaxunetib.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceef33711e---82593862554.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210914_1B810013C77B7452.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/33326673505.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/jajabololojasokuridanokag.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/kajorexemagejaj.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/kujepetetepezesidabog.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/jopezonerakigobizalo.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219111816511707.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/fufuve.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3d092fdb5039d9106cd28af117b0c500/vukapilamorazu.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/sosavaliwob.pdfIn PDF document text
    • http://amdind.com/userfiles/file/94668740910.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/fenogigo.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/64747569533.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/fewupoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+as+monitor+for+pcPDF 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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 10584 bytes
SHA-256: c1450b05adc318c8ec5f99a9cdd8bb889529c6272b9fdf525092d6e55acdf5fb
font_02_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 18428 bytes
SHA-256: 3248e0dba85d182e474d6ef106427dc455ab01d7fc22b174b62f0d1406a90a23

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