Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96007c43bd64f86…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 17:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2403d1f559f02ca6b8d207f97ad20ad SHA-1: 9ad61c58ad8950751dab4df1be594bdb3eda9674 SHA-256: e96007c43bd64f86ee61cac26aa8edcad923a787f133c8932c2ba52a780e90b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also includes a link farm pointing to various domains, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://quangcaosmsgiare.com/media/ftp/file/32170745913.pdf In PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e450b302da1839f1ee0af6b1543f59ae/42818667776.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/56533651955.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/jewaridorotadewed.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/58212760037.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/diramojugodofi.pdfIn PDF document text
    • https://kuepancong.com/contents/files/88542173534.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/muzesa.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/zuvudilepabulitofudotumu.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/zadukerutomuludemigujep.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4uk195v65l38pb5h4sl8klh55i/tegegud.pdfIn PDF document text
    • http://parentini.it/userfiles/files/82931330612.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/mezelupupuzuwamejul.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/xulis.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/femamidagodubofa.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/vasubotopukafijun.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/sarebivivatanopinufo.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/57572231601.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/danamoxolojer.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05ef1322f---tubipenuvuta.pdfIn PDF document text
    • https://people11people.gr/uploads/File/xedin.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/12890293157.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912081434934586.pdfIn PDF document text
    • http://status.cz/UserFiles/File/47313752448.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/rokefolibusebekeriwinob.pdfIn PDF document text
    • https://festacontinua.it/public/file/46805848714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+record+messenger+video+call+with+audio+on+androidPDF 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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 16936 bytes
SHA-256: 41f0b846f1ea344e8e16409e23e83d4abb9b9f7d381f2f05320eda400ca636ce
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 11060 bytes
SHA-256: b766a25e6acc039daa9ee9dbc64c528f80e838402245096c06bea94edfae7ff6
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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