Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de334e2679ebfde…

MALICIOUS

PDF

105.5 KB Created: 2021-08-11 02:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4e41af499b840648d478da041db7625f SHA-1: 250960806b514de6aad68a1b756e8f75eb98736c SHA-256: 7de334e2679ebfde7c133a9acd84cf0ecd75de3f62606e06b4eb21e95b13c1cd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs suggests an attempt to distribute malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=realidades+1+capitulo+4a+answers+que+hacen PDF link annotation
    • http://stellar-toys.com/ckfinder/userfiles/files/8286096963.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/19683253f7c1ef02513c07f3f10be286/85340854739.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/bff552556afb7c439bb59709e8b5f7e7/rozodelapulilemepajevun.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/zugefizulenufesif.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/lakus.pdfIn PDF document text
    • http://614move.com/clients/4890/File/39571824435.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607132a77eecd---kufigesogodujejofozu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f5f9833c6653b0db6f0be9bd877a8326/48871870508.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9c5590fb---44301953759.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/mixagozataxuletikagi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/509a6c13c4a1efa07f3a19cd60a613ea/18391903524.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/saxarapemexeruruvujiwa.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a762c262b85018e2c1d0f0df099b902e/kedimitu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/8de3580422f5a39e2104a3e86ffcd4aa/rewobuwarowomurafufo.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/69014860227.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/lijadesiduzamokax.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/kedipojevujaleditiwekidu.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/vobiti.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/55412144345.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8aeef5f5---wuvasabiki.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/81668066260.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tugelg8fnmuinimd4a154a3h3q/94928741556.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/21898462428.pdfIn PDF document text
    • 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_off00013775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13775 11116 bytes
SHA-256: d48c660a3b5a120dfb78e1a19d66c48265a31259d8197653fc78a3b6b2376c48
font_01_sfnt_off0001513c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513C 17668 bytes
SHA-256: caf7fe310ae0392eeb617e94b2cfcddfd20a5a45c2ebe96872ea9882f5c581a2
font_02_sfnt_off00017ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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