Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4dcbcd98ccf405…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 12:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee8844ba6825fe389f79985a5b196bcd SHA-1: b9dcf84a5888e5b08e0d1cc50f0467201e5e5c60 SHA-256: bb4dcbcd98ccf4055b0fa2ae5e5dcbf37fa56cb918d804c21f85268b9eebc73a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF acts as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://flirtproducties.nl/ckfinder/userfiles/files/32608553770.pdf In PDF document text
    • http://giteduguedesboires.fr/userfiles/file/7734107240.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-21/20210921105830676553.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202192325392028.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/56173099766.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/tapete.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/43089920508.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/73136513971.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/18912bf3e51646b633aaea5f5ad193e1/90435377190.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/pizujowugujugi.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/13127831370.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/mulurevepib.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/puxawizolemafonefew.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/72909438742.pdfIn PDF document text
    • http://edallyshop.com/upload/files/dojagino.pdfIn PDF document text
    • https://electroagro.es/pub/files/28690718413.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210916192239.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5c46b49e30416ba243e2c65545b057e7/ragukamapaxevan.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210921121537.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/bagibut.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/72581153273.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/funufenodi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff45065cd2---gepitimuse.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/zerirulegotapisiforafed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=funnel+chart+excelPDF 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_off0000af53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 10124 bytes
SHA-256: 47151a55fc0de5e3f47341dbbabeccc867fa2cce4c95d2b022b81b5e66a7f118
font_02_sfnt_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 16772 bytes
SHA-256: 8bd13e8d81cecc51ed286f9768e7a20c9ea52ce5dbe11ca874386d828aa9ffc5