Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f588c0c0968ddbf…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 05:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 334986c218e2ceadc0b864f622914dd4 SHA-1: d1493a749f4641e8acc14ce8124e362300e91f09 SHA-256: 7f588c0c0968ddbf2a0c9afdafa02a46bec435929af2f1f69ac514ad3f3f3992
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.mearesandassociatesllc.com/siteuploads/editorimg/file/52442707482.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7372402de---79709994650.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/86466490715.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/lexiloranugasa.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/wapemaxulumuj.pdfIn PDF document text
    • https://isosklo.cz./uploads/83635806746.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/17445712101.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/75385886696.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/kedabewixinujizumut.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a3e11a4a75eb96a683b127388e704e77/rukewenetolegu.pdfIn PDF document text
    • http://insei.eu/userfiles/files/zeser.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d196ba8694---ketusutuz.pdfIn PDF document text
    • http://armanetti.com/images/pufesenumaf.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/89761253836.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/21917181892.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xofubin.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/gegupelod.pdfIn PDF document text
    • http://contua.org/userfiles/file/jigigawozop.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609317e8dca9f---xixanopajame.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/tebinexolategir.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/46767936607.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/64279333408.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/71435620087.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/80448109787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sybil+book+pdf+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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 10500 bytes
SHA-256: 8d44fc053109f7dabab8fd6fb614780de8ca5f6b49effca73a31eeeb5c1fa4c6
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 17312 bytes
SHA-256: 15da0a3717d8817fa6d2a1ee07b072f06ff415173aa855896cc9702184f790f8
font_02_sfnt_off000135d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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