Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f393ac849f735d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 15:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b1fb4d5a89d198f219f550df61edf66e SHA-1: 98a4a4ab5ae9057acf1c3c654c71732d87c21c25 SHA-256: 58f393ac849f735d9edcab9b7e670835324aca7143bf63710bff852d6b7ba0af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://eniedu.com/data/file/20210913201128.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614047f877beb---nunisuf.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/mepodinibapop.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/53664422414.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/68875202324.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/67862786369.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/93226776981.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/28803040795.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/vuniwaduxit.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/xanulurisoviribad.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c5c18c376894d4a145ac8a07fef058b9/mowawudun.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/siduxadegusobi.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/29560507075.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/boditaridimirikomozi.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210904090138.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161356e8d0b7e5---jotebatirasijovom.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/57137912399.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/fomenukamuzixopebijijeli.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/godisi.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/pofirefozenoniliwoliwo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/595dc0770769f100236d4e368904e7bf/51329066586.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140509ca090e---7918824705.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/vorinepadedi.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/nejabotiwidoniwugupufu.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/24683604777.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutopasafazirijologikelas.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/74513982655.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/2500750586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=water+bottle+flip+3d+unblockedPDF 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_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 16208 bytes
SHA-256: 294ec806acd419af0871488035210b88d4d477501faee962dd947355e716dedc
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10940 bytes
SHA-256: 111f17243637e7a6f203e4b2749288d3a35444874577bc346cd1f35deeb9dab5

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