Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5b0d430c935d80…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 21:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9b2c31552831da3e1c1c1e55e4829d5 SHA-1: 228c90f33452d4d68045e12c00e30702956e0a99 SHA-256: 9d5b0d430c935d802ddef89bc7d6faad620a153766068330b16bd11dd401ecb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or redirection campaign. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://egokituz.eus/files/galeria/files/94620570656.pdf In PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/lesanuzuginefovofo.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/parogijexikofoxi.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/71887848617.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/gisowisijatuwarugabol.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/22771015812.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kigamozarovo.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/62409954193.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/571d22e0c11bb8ce356d0a22d5ce77b9/fejoxopenapogidujaw.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/64rm3s15gjilpfp7h4b91rdprt/pegexojapivelumifijiz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c266109e4a4---88192763707.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zulipamelofakedut.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/99143118647.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608421b4817e4---dakemikibotidir.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/giwowafuxoj.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/31488650749.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97367b57ca---39843012553.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4e448a70afb0196e6373255535384c45/22503929993.pdfIn PDF document text
    • https://emmaushuis.org/pages/70404668657.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/jilokuganujemoge.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ce8ab07e---30218874598.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861df7ee80b---93068636504.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/16603354612.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cdc9f020---gidebomenojuvefogolufujir.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/34611778632.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b63f53bd4---wefexatitidarexava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=comparison+of+adjectives+worksheet+eslPDF 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_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 17680 bytes
SHA-256: 378ce37424a01f1513b4ba349bbd69f381568dd7ff64708d7ade0db06a168d30
font_01_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 11292 bytes
SHA-256: a135c71bf12d91548db2a3ea60c1e26b0ce8ef473b2e52f3662ff7738c460f62

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