Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05bad038dc4fa17…

MALICIOUS

PDF

99.4 KB Created: 2021-07-22 01:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2735cf2845d1b4fd43ea22f1628b37b SHA-1: d4f58ba23c9b7936b8a0ce68d117f8e43ee9a09d SHA-256: f05bad038dc4fa17503915a57b2c9f8829a9216f9e6e0cc8182cbad0ce395157
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082243896302---46089967718.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/826a39c8105e8e184a5f696630dbf8ae/61362564460.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a75fb97f12efbaabe7207511c7ad4574/tobudazuxori.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dtcpt0mi9739htg24ek8qvjm8o/rigapeboxenel.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/zojupor.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/fupizapovobune.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e52be31018b---5744921294.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/sulix.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/pidewopexuwerafonopum.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/26719938516.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/jixekugebewi.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/37876699912.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/87443260937.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/84632056068.pdfIn PDF document text
    • https://subarini.ro/mm/file/97348247486.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/21961689716.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/sitovuwelibu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f4c63e535b93330bfce8028b7917ed17/23470596913.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160726b15a1141---gurovazariv.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6d7dfc1acd74284fa20840c9c3b9f8c4/jizeni.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pisuzutubupimojusivo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/05bhe9brjksnukrvl4thb3e1ki/zilagazogeledurajuz.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dcd2f19af---xovifilukufimadozipabis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cat+purring+meaningPDF 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_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 10392 bytes
SHA-256: 918ebc586ce7c92711a4e57a597f2c76308135b334a724f4e626a852bf0c0da2
font_01_sfnt_off00013af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15305 16880 bytes
SHA-256: 9f57f04f1e4f49b304d24316310e78a36bcd228342491aecd96172359423d350

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