Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb895375114cf10…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 05:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b355b6f43cab7dd20c303ce2fa896ba SHA-1: 1a126d7a02dc68e8416e2d4eea53c04818a61391 SHA-256: efb895375114cf10dae07ff01c652f8bf0d55914b82afcce7a9c6b0c53989d04
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c72b71ac8---jolitubogu.pdf In PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/abthutj1vv7mokh4h5kk6j8gt4/31540911209.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a01b59bd---96479055837.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kelhvl11thqltor7ebb1r9j9j3/27069093473.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210621155606.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/pigisewonerujire.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/kalogebosusego.pdfIn PDF document text
    • https://people11people.gr/uploads/File/89552521981.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/14576608620.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/xajuwegovudijo.pdfIn PDF document text
    • https://medtek.vn/storage/file/19265103836.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/67f82520e1edfb6e6e9b059daab3c2af/tifiluvovigejososemazade.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074857571b93---30634109940.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/bufenuv.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/61886849728.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/lowujujotufen.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bbd9ab2c---37650477702.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/kuvofinar.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/85676618427.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/86519aa2912d075e272c619806bda011/14375249710.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d3479f3ac8d7c31d3e8f3ead67716562/ginikarevugisugegaxijuri.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8e39e307---1926861084.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/34378867532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=reducing+stress+in+the+workplace+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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 11220 bytes
SHA-256: 22892fab011e16cc7e383f73615a8abca5bb772d6c2afbd827ee7ac0de4512c1
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 17156 bytes
SHA-256: 3869e08414728a8f5851c8400c7f945b7e6fd0b6e1168ffa7ed66eb902f2fb34

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