Malicious PDF — malware analysis report

Static analysis result for SHA-256 984b722de12cbbb8…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 13:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 325adbdc8f9e58fefc89e75dd6cf1b7f SHA-1: a98530d2681fd0aba85fb9c8074170b6f29f7bd0 SHA-256: 984b722de12cbbb88f5010b8d1d46e3e5007c71faa616801a5b813737adf4d23
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users. The PDF structure and embedded URIs indicate an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6c314c9b2---duropir.pdf In PDF document text
    • https://matrainagycsalados.hu/userfiles/file/mitalugorigam.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/1658441381.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/78845718069.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/dafikenulesagexur.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/wojeg.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608503486e052---42655971061.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/45610228747.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ip7qoq4qupeimri5or4tjpofi6/xumafabawolakugedudobireb.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/vufofotenaxasorapupazewo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a217c99d---94198202534.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7c66152d---gupufomuma.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/gikowinopavemosij.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jidotelumu.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/zaretituri.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f099c1b82---budariseladezibezi.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db59da0d4e---xuwomadoviropusoru.pdfIn PDF document text
    • http://vipdiler.ru/files/file/gejiritelasumuse.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/fovewebefomuj.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9e774438306e2268b2b274734418ea88/gulevebelale.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b53c1e4f196---wuxizesogilamupesaxa.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xolatajakajaso.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/48724845385.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b7dcacc6b6929e4d7711b37eefe5b261/44736585178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=romeo+and+juliet+act+3+questions+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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 17020 bytes
SHA-256: 5b02c2a85f5d0ba9ff34e84761128784f4f08b4483288add6011dd1368c7a138
font_01_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 11276 bytes
SHA-256: 9bb891ed09274582cfb816e93b7f015aa82be5f8f8ddffae65db7eebe4bab485

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