Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cc0ef81eeafb41…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 18:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a6f6d6bedf90b5476afd89e1d91d29a SHA-1: d56d155892729a5e88de666fc111061f9a50c84b SHA-256: 50cc0ef81eeafb411c05eb2995b21500635a517c01946b4a04781d2c4c541003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt. No scripts were extracted from this sample.

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 https://oniceh.ru/uplcv?utm_term=corps+of+engineers+manual+em+385+1+1 PDF link annotation
    • http://edukoc.net/userData/ebizro_board/file/11508775324.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/vegogulefugagikuwejep.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160775e86862f0---wulasukagoso.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160941fc320dab---dejudivurulenutisogi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/jikezutowurefedadebekipuj.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/72923351972.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/nifav.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/db54b285b08e04ef7ba0be010e3ef958/garowexodinuxe.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b573013253b---lonofuminezepesuviw.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/27781370491.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092453403402---fujutopozamat.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///nexepibesi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c0cf82cae---gugurexivawidik.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tu00ae512ghlul0q3o91q4la0u/89668404261.pdfIn PDF document text
    • http://skomi.ru/img/files/file/4674684043.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/14261841651.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/42386a6e1b46c9b4503238fd537a8ddd/pijemesitoxo.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/14186400117.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/favosudegefimisifidulun.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xezanuzoli.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/98441415855.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/23539293450.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vogovabonexosadifaxuvupib.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/10459777025.pdfIn 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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 11300 bytes
SHA-256: e0975bb2c7d6cd44092e10d89046fea60d58f5e252fed7c78af9336ba0678909
font_02_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 17920 bytes
SHA-256: 312612cb0f93314254d900d0f9a310b7add3b47e1e80a96402fcd3a3c63a1bc4

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