Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c9f2fb49244b78…

MALICIOUS

PDF

97.9 KB Created: 2021-09-06 09:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2e58dbc17d74f89b4ce7cbebc5d8a95 SHA-1: 7daafd8fc7b9c3b0750cd1c1212a23f733243d28 SHA-256: 09c9f2fb49244b78892fccd21b026f10e4259128db914ac6b2f377e37eac1d05
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various domains, some of which are compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=algorithms+in+a+nutshell+pdf+download PDF link annotation
    • https://toocapen.com/files/rabiwotuwepofutelamajuka.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/97108304346.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/mibedajagirevesitej.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/fidifisenaleref.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/peworekavorex.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/36262b42dcbb9ba5234bde9fd7a6e692/5219242381.pdfIn PDF document text
    • https://invest.pl/userfiles/file/bavinebiwa.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/34342450872.pdfIn PDF document text
    • http://thongthien.vn/upload/files/4183444583.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/89978341958.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/37771138229.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/tomobasudemifi.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/sagozadaneloz.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/55551179999.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9e29ebbc35a8e3b66e5f893a16a35153/ferijelulabaruga.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/sidaluvopusofowirexoregol.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840aab3f4b---39749959672.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c997be2a86---58661455123.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pojanosaf.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/42861e0ae04eeec6597768f98a2f2dcf/13038814214.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/boraragumifuvegun.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce22b4c1ad---tuwutesimelawit.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27779313650.pdfIn PDF document text
    • 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_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 17032 bytes
SHA-256: 8c42822596bc403748c6debae48c4ceee9e81b55d5bee9bc03a9f0ac4ed62e6e
font_01_sfnt_off0001489c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B3 11112 bytes
SHA-256: 2af79ec5ae757d95cac437514bdaaea68a015888621df37deec14c7c6355e459

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