Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3410537e818bd2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 16:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4248b121559c728af3119247e503080c SHA-1: 74a6343456aacc55b0d1a192e1ae20a13b693db6 SHA-256: 4e3410537e818bd222cbf15fff3f49191cbf6690d92b66cbc16f178651d16eb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/xafixo.pdf In PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/kosinowam.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/66834341884.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/43684010397.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cd451621---rusufekebedafaw.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/95675360548.pdfIn PDF document text
    • https://alutat.com/data/file/sovudefuzubipibeti.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/narabomizolokagegi.pdfIn PDF document text
    • http://patroha.hu/file/62160476812.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210906093743.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f5d3f9f95b88b3d0ac6b35853572eb5b/runosaxadotadowoku.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/pesexazilonazobeg.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/jisagunixevosaveseboro.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/towuba.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/39980745205.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/83837942982.pdfIn PDF document text
    • http://hairandoil.com/uploads/zivagegipetojovovufofivux.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202194116537119.pdfIn PDF document text
    • http://skupka54.ru/upload/m/63022562607.pdfIn PDF document text
    • http://sung1.com/upload/files/95492665497.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b3cb073d6d01c664692b6c5e44e6bcc1/3100448070.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/niwomipofibiwesaxurelowi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/32e7165073dbafb70e6261cf9e7e0a17/kokapilivolese.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614547bc2177c---25657625513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=midsommar+full+movie+eng+subPDF 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_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 10900 bytes
SHA-256: 1e21c3e6a8588657a892af054c06e30877698682ca26f14651d091313a1ce5cd
font_01_sfnt_off0000cfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAA 17352 bytes
SHA-256: d899bd890dbd11772f13f1057b4105412775d321f247c70b8dc41864a923d949
font_02_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1