Malicious PDF — malware analysis report

Static analysis result for SHA-256 3384f044e0bf083e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 11:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae864c608b988f3d736fc849717a8cf3 SHA-1: b6a5014b331bb6b8f4517de699923f37810dd7f5 SHA-256: 3384f044e0bf083e670196c52278c6d234e6a85014e189bff1df74c0eea67910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://garglob.ru/uplcv?utm_term=football+manager+2019+download+for+android PDF link annotation
    • http://domingo.hu/ckfinder/userfiles/files/lowelororuxes.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5b6699662ccd5647cab8aa17edc98f57/76423052311.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ne9vlm2h00lrmoopsu3d84eecf/wuvebokotozodeviremuvoxi.pdfIn PDF document text
    • http://jcpingie.be/public/files/buruxivepibonorike.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/55379804114.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/niwekukijelenemanemup.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jelanegamupavepewuwupalut.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fowusuzalumofugi.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090208160895.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/61295048032.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140b26fcde88---lebanavelefadugilit.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/18690023778.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/71118379360.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/51921592901.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/zezafizolasef.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/jepaz.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/gagomopogujid.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/javar.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/tesigefafigubasevoropavof.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/nozemikejajutukigedodowok.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/tutugibufovolen.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/3480437556.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/18137299239.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/wamogeke.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_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 11192 bytes
SHA-256: bdb71c91f0338adb88804d603be3f733fbc656ee008da1aead4e98d4218199dc
font_01_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 22972 bytes
SHA-256: 7d29c7ba8eb8215748d0c6a153e48a23df9a0b4bc53ed338354d518e0742840a
font_03_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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