Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3dbf9bf96a164f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 10:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7462931743b932142b885aa40ef8b445 SHA-1: 48e53a17182da667625f59f1259a6616f79aec17 SHA-256: 8c3dbf9bf96a164fb242ec1fd7594cd6f7cf74fa902545e91bb830e1051c2111
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of link farms and the use of compromised CMS uploads point towards an effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://mkycc4.com/kycc4.com/userfiles/files/vofafituxuvawiru.pdf In PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/88009279781.pdfIn PDF document text
    • http://budka39.ru/files/4704571262.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/sazogaxupen.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/63614117095.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/53536857525.pdfIn PDF document text
    • https://mk-pamyat.kz/uploads/files/tudefexagurinumub.pdfIn PDF document text
    • http://dsagco.com/Upload/file/govojesagojatodibabefumag.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/lapubifa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614595f702414---rebux.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/seduvexuxanotolejak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614497e696097---71997342760.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/62708268438.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614af67ec5211---40751235732.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/93416217732.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/wukakivimexurok.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/jizodulil.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/89806418169.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xuroxomogonorozofat.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/94840161447.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/64633368871.pdfIn PDF document text
    • https://netpage.info/userfiles/file/94249495315.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/storbbqv7d77fqppr9l83785k9/57657115703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+omega+ruby+free+download+gbaPDF 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_off0000adfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC611 10872 bytes
SHA-256: 0e2721cd56c871a27fcccfebc967f52c647c27d1f2a49a2d03bd89d137d184ca
font_02_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 14876 bytes
SHA-256: 7799426e77f5db521f6123edd74c19fcdbd7c05b16cad164908f240ba0ee9603