Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f04f995e9d19582…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 03:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 816035adaf7ef4153b363e14adab1575 SHA-1: 39e0c8ae804fff3f7a2e88a16c315927f8967228 SHA-256: 7f04f995e9d19582e3c67654729e7b7353309665f27d10b266e605a1cd30e68e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm designed to direct users to various download sites, masquerading as legitimate software sources. Several heuristics indicate this is a link farm hosted on compromised or disposable domains, with one URL specifically pointing to a compromised CMS upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://muzycznescyzoryki.pl/userfiles/file/28338597095.pdf In PDF document text
    • http://www.radanhorse.com/resource/files/vinusogewanovosipenanexer.pdfIn PDF document text
    • http://exim5.hu/_user/file/jerikijudamagodudurid.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348c8796885---3449674563.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05058216d---64964354685.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/xunopokif.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21b5de9f0---zapusovofeguzugibuwa.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/dunukesafagoputatafeka.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/sibomolidoxexodafitufokos.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/lujidotemuke.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/kotupimolekijuwodigu.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/sawogije.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/timivuwodane.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/rufevuwupujurixeseponasi.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/30768462924.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/kaxojapisuxibamavubeg.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/wariteperagefaj.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/mewivenevuzajiko.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/28b7ea01b31b51f70cfcb8d14282d540/jokigunusiv.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/runubis.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea3f65453---92015204194.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e1302a597f08a50a52692eb91b45075f/zuxekuwepov.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/jukowirijajagigofijixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+bloody+roar+4+for+androidPDF 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_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 10368 bytes
SHA-256: 51f1c4dafd5f9358b47034174417f1cbb2011115adb56797bc621c67d556a94c
font_01_sfnt_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 17400 bytes
SHA-256: 46989b89e1ac1ec33c59690f51e85efb0b09247db1aad291332e1d16986debc8

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