Malicious PDF — malware analysis report

Static analysis result for SHA-256 d146bc17228ad199…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 08:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f17bf243f7a8bc2ac0ce9cc93e4bd586 SHA-1: 1d327b4894257d6af3a58b965bfc42023138774e SHA-256: d146bc17228ad199db78b80979e6a6d5f6ccc9aab5acccdd8452c222a7c8ac94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://netron.pt/app/webroot/media/files/vuvobonozewulomel.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614514ee53c7a---patefezawaloxepanilanu.pdfIn PDF document text
    • http://bankerz.in/qpic/files/18441484872.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/32627567872.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/jomudi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/82426472871.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/36921049640.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/39601482601.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/jasagurinuxuva.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/ruzokasupukis.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/wixugaxun.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/44901919564.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/jinoridozojesevituko.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904144918110.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f7566a2fc---29903090945.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/liwupipisigibodujomeweden.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7384df9ed6d45a403d47b5e6bba09e8c/95043393936.pdfIn PDF document text
    • https://chineseclothingonline.com/File/5462547436.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/64248763350.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pqqmb4bhm3n3eerpeakddljfc7/2794689511.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/pifaso.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210913_113702.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/61307047450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=finding+nemo+full+movie+freePDF 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_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 10412 bytes
SHA-256: 230c63159a4d504615d3339339cc57b432f98353b2a7ffd68e305cb5c98a8d54
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 16872 bytes
SHA-256: 6a1848605daa6f5cf3596b82f1f69f8e0b42384dc042b9d23ddf67fe34ab6dfc

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