Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecea571c368f340…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 04:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7cd714a00e6e4708e97b4076b17bca88 SHA-1: f256a782e5591f658808533d1f460564661e1deb SHA-256: 9ecea571c368f34027e97d5387af005bd538334d26dda85764bfb5a416eee0d2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://mingyi-lock.com/data/file/userfiles/files/1202591709.pdf In PDF document text
    • http://lysfyyy.com/upload/files/fedikonolelidinodumite.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/48418265119.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/goverodudesemewij.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/13848057797.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/19310120916.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/rafopidopiwefewowiru.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/11701820654.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161323f1f7e8a2---mitalelanafava.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/24575967996.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qqfd5gsaj9hihiagb761pedk17/28913880065.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/24314416681.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/tinovuvexogepaxakefanik.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/jowumesulubefodi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/82hqan3df25guqrd8psl303cc6/dakiwipefiximedefasiwo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/41b98033e2ad512b7bca8a2ac980c3f6/220164982.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613793d14facf---visinaj.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9217e83db9aef13207b9f6c4631508e5/59531137731.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161326181f018a---23107491953.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210906084751.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109040454038559788htg6h.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/78007855994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+we+retrieve+deleted+photos+from+phonePDF 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_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 10944 bytes
SHA-256: 2032e8f8743ae15fee00e8fdbec932faa29c9808542bb2b42bc78ed3a1b18d36
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 16036 bytes
SHA-256: fe4dade2f6eaa8298d28a6cd5705e30d195b09989072b4d77381587f6b26c623

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