Malicious PDF — malware analysis report

Static analysis result for SHA-256 6923182e6b3b6dc2…

MALICIOUS

PDF

96.7 KB Created: 2021-09-01 10:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34ce9dcc3e0ad308f2e04f04aeaf1189 SHA-1: 626f01e7c1125e34ed0b7f05f764c3c8a3dd4b19 SHA-256: 6923182e6b3b6dc20b79ddd94ec7652d3c8dc796359ed7f33730b4d4045beab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The PDF's structure and embedded links suggest an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/cb1835657de559cffbde953bcfb29d87/savenegefox.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/mefekezogilotupilalusi.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/riwovogi.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///zajizin.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/waxopanokowawinozase.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/21216459642.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/11779593444.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/29841491356.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e88bd43fd---28559472188.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6cf5b1bd---89354389883.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/wiwen.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/icet5ptccqngb3vjos6ua81366/51574224674.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/69030200258.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160744280da0da---rufowojifebemumanapafose.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///79256739838.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/87628206400.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a936e612656---5576611299.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/10836488523.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/fuwekeboxexudu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607730cc2b1fe---remorixabu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0obigr23a8pat2qi03p7emgpuf/89164887228.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/bazatazuminarevegesenux.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160edb2ce53500---mumagopokobozizuwulu.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/berage.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/47794519022.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/25238436475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=falling+away+meaningPDF 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_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 19040 bytes
SHA-256: e4af14e25c9cf2a1ab350848d38f6a1f25d5e93664fa88856773cc5e2e709680
font_01_sfnt_off00014663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7A 10144 bytes
SHA-256: 5793194d0210ebcc57a579fbe00697dd47b1a8f247d200688f7e136575fb5853

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