Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d8bef9f41a5b6e…

MALICIOUS

PDF

128.8 KB Created: 2021-06-30 01:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ebce4ab81a55a61fdd01d244791bd84d SHA-1: c03a04a55eeef14a574472303b191bb2064cd5cc SHA-256: d6d8bef9f41a5b6e445c0238fca0e642441b72652f4a532cbeda2f4f4e0fc413
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9695

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=black+ops+2+maps+zombies+dlc PDF link annotation
    • http://brkvinc.com/userfiles/file/99042188614.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/wisarolulasilirobubolu.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/814890f20935ba71a714b95bacabe52a/jituvusujupojenon.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7d4d0ce96a4f5050bb08d4c1e07b91e/gobuwagono.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/vivigedemogifukekodifu.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/zexazewanokekik.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d7c59683347dbc19767463666675b0f2/50036377757.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/69107595098.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/8a51c0ae764e78264d02dbb1efee9e50/bagodanidoxofutuxa.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/5aj00uv8ivqdl5vi88nag2lhjr/30848295483.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/5512712798.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/n7jmakdnh8vcsvri2iu2a2irh6/66981192074.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adc39065b01---ninunulegumuw.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/sokatoluralu.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/xotixiwimeduja.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ff2c5973da2e4f0f31cfe17379f77551/63931724378.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883b799e2ba---56112816835.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b4c18991279a0f9ea9847a56cdc522f3/dosifamokutigigalaveba.pdfIn PDF document text
    • http://katachizu.com/img/news/files/mudaxajedigiga.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/62607657505.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949f5500e7b---90024989293.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5610c68d970dd15e57440c7a4c2e0d4c/zinagexizipoxolubebafaz.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/zibajiv.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/27686238437.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/10170188111.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd50a35826---dasunivowezuguvifutoxoke.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000181cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000199e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199E6 10836 bytes
SHA-256: d14f128754ab8e9d8833ddfdb58d95a2f244e42a7cb2a3103e966a98c75f060f
font_02_sfnt_off0001b2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2C5 5000 bytes
SHA-256: 794b849a44c582fab63a1daeb30f52be5b33e48adf5ca5fa3865be75a816a9ec
font_03_sfnt_off0001c56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C56F 17764 bytes
SHA-256: 305a0f3764a47951649e1a837bd6ba697eba043bbfbf8904b731834a27591653