Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3adde73db114eab…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 04:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 008ecab52ac5bf9220a6d9da8833dd08 SHA-1: e170fa0deca6ee63d6a389a997a0c6ed8937ad38 SHA-256: d3adde73db114eab1268d6004be6ea186abc6ffe7fd8072a0959693e180b37ae
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66234530506.pdf In PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/888d3d2e8b73d52515f0941317a4724f/21014483571.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a2fbc8628e59739f810e79e85ab88981/66866402937.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/5394623061.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/vupugedun.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3889bc289a---razog.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/sireruj.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/39463680642.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/jeserodamuliki.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/funogixunowibirow.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/i0ft8sl69hjnsngcl3qjt0i8d1/5450396457.pdfIn PDF document text
    • http://computerdoki.hu/user/file/82994267524.pdfIn PDF document text
    • http://ridendo.cz/files/file/95190078748.pdfIn PDF document text
    • http://congluc.com/upload/files/figotujuvanipa.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/04baed1e9bc1efdafe11b6003ebfa2ed/gabitinozuweritu.pdfIn PDF document text
    • http://coffee33.ru/archive/file/28922486837.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/17af90bff7cdb0eb429d9e1f7d8320a0/56029783692.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/16jns7u799ro5ctlsrchchhhtf/fotoruxe.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/fupunudijukunomeni.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/sejinopa.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/228bc37367f8c216fdf7b27445576565/44821378284.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/48753992073.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/41750898548e28bf9ce1656bd75ee428/45172456835.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/76066170736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pic+to+pdf+converter+free+downloadPDF 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_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 10596 bytes
SHA-256: 4e363a23528a136c376f565c9381f9598064d4c649c1f3d20919b7201cf14787
font_02_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 18180 bytes
SHA-256: 7bbcdecfd29611d7af0bffe97f19c43cb995d27695528566e11e1791fb8d7e33

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