Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b97cc87694ef295…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 16:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 821f7dc62ee441f435400dd3b9df5694 SHA-1: 83a25ecc23610d29ab8de4c829ef14127748c20c SHA-256: 0b97cc87694ef2955c169368d9e942e864daf4a111b47bd9ec9be540353fa39a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript (T1059.007) is a key indicator of the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.peretprod.ro/content-images/file/zisupalemu.pdf In PDF document text
    • https://allcreaturesinc.com/files/files/5544110302.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zosajuzojivitasepe.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/35835759556.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/vinakijatesanogifijigi.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/konidafinit.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/6do7nndbpekneb8312n77lmneu/faxapevimuzitilapipadibi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cac3b697e6d48123ae5ae82ca14719f4/selibizogexerukodo.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/49739703711.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083281168d84---mekezoxisasa.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/64521668806.pdfIn PDF document text
    • https://defi128.com/userfiles/files/luzunogojudaperomole.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cfc441c3e---jogepilax.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/ruminananesivomukawel.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/91973285053.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/99194815297.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/542b151e9f4bee0efd81eefce8216a5f/79073239650.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/df02818f9bd0fc437572de6999d4cb8a/fudutiremaxodameze.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/86238328987.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/95330497271.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/66293616206.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/39667509599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=moonlight+sonata+3rd+movement+pdf+freePDF 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_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 21076 bytes
SHA-256: 8b2ac6c5c565bfab051d25a37b6c7bbc3ead9a7f1ce7581ff05de5b65d66922a
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 11176 bytes
SHA-256: 569247ec9cd031cf85c68920331a4523f52b645609bdd66587c2d59e436e6856
font_02_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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