Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c23a6565ae5ff5b…

MALICIOUS

PDF

87.5 KB Created: 2021-07-08 10:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09578928e107da2ec7fb615d0e49b8b8 SHA-1: 4a39bd80d5c3c407ee9819de0ce078d7623b6e50 SHA-256: 1c23a6565ae5ff5bf3bfea6809e5fc8cf5d50e7bd75865b6bea220b0cec84b67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://mea-travel.pl/userfiles/file/79952997965.pdf In PDF document text
    • http://www.toeterloeh44.de/files/rinakowevejorugi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d07f0bba8---6177669149.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/91167076888.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/mojupowilugepasuvajuwuri.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015362d62c---88696484441.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/bukokuwasakiw.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/wipilunogulelu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f175ed1d899c911ffa3c939af94784bf/zelomudojaza.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/wemuzupamefuduvamemaku.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a367c65fe---wobakefe.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c58dd704---xufaneromujawotenu.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zuxob.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/loxafaku.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/s5p7uh3jesl8n8vnv9blnaob15/xezarifivufodakovofoba.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/59955679064.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/q26epk9scnob8bvtur6ed4nla2/76317419159.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/koritanipibusog.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092279b17b17---vepiwefa.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8307eec4---nuvegisijarugirizoda.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/pividonuzevetojiv.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/154d5cbd9376af8706f78c61842f720c/47576519870.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/af962fe9c674e6d2f388dbf830368834/47176903340.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd47e81a7---tegexijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=set+for+life+saturdayPDF 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_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 16228 bytes
SHA-256: d699bbc1d0aabebdf34fac34a27885bb85e9cebbd0b8a1ab2e1dccacf8269e70
font_02_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 10532 bytes
SHA-256: 9a6a3b1b04b211b8f1bcbdd4ba1bca9a3e17ebf231cda72ebfd4c6cca9f0fa5b

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