Malicious PDF — malware analysis report

Static analysis result for SHA-256 9488dcb83a757cda…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 21:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cfc31d78813116f73eed573c849a2c6a SHA-1: d2298a3be387d073b16abc384ceccf68bfe026ad SHA-256: 9488dcb83a757cdabc15995efa9841e6aaeb976cd3f73859eff98fcb4cd46372
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. One such URL, http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16141ebcbcfec4---ketitimele.pdf, is identified as a link farm on disposable hosting, suggesting it's part of a malicious distribution chain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16141ebcbcfec4---ketitimele.pdf In PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/iav55nucenbbng63af5t9h06u5/kusexej.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/doganadibo.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/53187253628.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/72301cdbd40bab7a902ed1ed7a495d6f/58580006722.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/wovutipefenetolusaxonitup.pdfIn PDF document text
    • http://classtool.info/upload/files/volenetasumelotobad.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/kimekabif.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/wimariforafefonu.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/40814854653.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/31178558545.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68b8b8558---dafafepivanixijulobo.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/23857477359.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/mufekav.pdfIn PDF document text
    • http://usmleworkout.com/files/file/53398678604.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/54708201765.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/28499807324.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/16199430854.pdfIn PDF document text
    • http://4darchitecture.org/img/all/fotaxi.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/xudovizoj.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/97728064532.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/75455561832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=windows+pc+emulator+androidPDF 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_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 10856 bytes
SHA-256: 4c2ebe20205fd48c5da489ee09ebbbe6f8ace30c44c70d58089c8fbe303cf644
font_01_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 18048 bytes
SHA-256: 8c21c0d3d58fc48e54066915a3c6619fb15e81053edc6a4e16d6585748a73be8
font_02_sfnt_off000126e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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