Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e55da740d7583b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 20:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db62e37edfdee7234dc83813c7c44107 SHA-1: a39aa5cc9e315f524a2e0ca67b2a81814141072c SHA-256: d2e55da740d7583b3467519496760058aadb430f679b30e206f0755a63e48c51
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to these malicious sites.

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 http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ee79560e20aabbba72dba336312ee997/bewevunogowanam.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/19cfef81b22267a5cd470f8fa323182c/12576151858.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/77016551749.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/95792726303.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/bipamokudiku.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afab71992f---kimebu.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/93056824710.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/xedof.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/ripumonuxamidifanep.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/xugunejevalipigefosejug.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/89343643082.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16304758271279417454.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e95c970ba8583014936f59cac94746ce/15695668783.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109091024488023.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/50314471200.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/wejewavokapedisenevozixo.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/lonevilu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b25b2046---2858712959.pdfIn PDF document text
    • http://prompol.com/media/file/sebazufiwadorelego.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132855a05113---91370651803.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/74789264593.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/zolewu.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/29503857332.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/zanotejeguwusakivumer.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/putexemabipewifedisuxat.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/86755362583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=from+the+notebooks+of+melanin+sun+pdfPDF 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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 18036 bytes
SHA-256: 8c69d0f9d36790ac2a530934bd1191412d977ef424d38c41cf48603bacbc1aa9
font_01_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 11072 bytes
SHA-256: d52e202cd53847e20d10a7274e915692f96d3e439037b4149afe5facf070e28c

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