Malicious PDF — malware analysis report

Static analysis result for SHA-256 087ef89d5992b497…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 10:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e3a5b8612a3880f42cc93ba2b9cabc01 SHA-1: 5e836719cb433082739b64beb479fdde9e08e2d5 SHA-256: 087ef89d5992b4977ad6fa6ad966b99c92c24da0909e36d7ad9c42ab0b8bf8f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://munnarinfo.in/userfiles/file/57759771390.pdf In PDF document text
    • http://teenaramainc.org/clients/875997/File/nadasevo.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/5372315662.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/62c119b522c47a71236b6a1e643abce1/vumutadiwivol.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/fa8afd88ab43c50de590f646b6942a3e/19416247068.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610446b05f106---47630472413.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/111e58e09329b8b2f71f767a1ce88686/javabuvekomaxudega.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5cfdb189f---18643710263.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/40167155008.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/38973067781.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/xitafofetimisijefagasakig.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/besef.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160872ac85dc99---87402153708.pdfIn PDF document text
    • https://mytopics.it/uploads/file/fogirowakobi.pdfIn PDF document text
    • http://bankerz.in/qpic/files/12384190778.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/27537324947.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/nagogijapoxa.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/8cb2153c06e29d413ed8124c56b3fce7/makubobim.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/zoxomobepowuveva.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/307360134.pdfIn PDF document text
    • http://fxlcd.com/upload/file/votelanilekola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=signs+of+diphtheriaPDF link annotation
    • https://medlineplus.gov/diphtheria.htmlIn PDF document text
    • 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_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 17276 bytes
SHA-256: ff0922a6f75b3ee06b2a95117515903455476caf8dcd29bad5f43f5f92759bcd
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 10808 bytes
SHA-256: 67b46ee694d7d81a17c683f57733f200454d5c27d34d702d09d8381f8ca03e31
font_02_sfnt_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1