Malicious PDF — malware analysis report

Static analysis result for SHA-256 11719084c62f392b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 14:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 170b1666d7cf6cec309f9febd485f66a SHA-1: 72097de6dea29a2b9224d226a2ca6cb52eb4b747 SHA-256: 11719084c62f392be09409493359ebb2a9c4d468c4288bcd74ff4d583e86e900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of hosting numerous PDFs on potentially compromised or low-reputation sites, likely to distribute malware or phish for credentials. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=conditional+1+2+3+worksheet PDF link annotation
    • http://hum-lucknow.org/test/fckeditor/file/58015583712.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/18099689844.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68d71e670---sowijekuralemarazogisaxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a374cfb7200---bemiwabanuwulafexujado.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/tuvozixapif.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/porazepirunomo.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/kubusosanirum.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/tibofekejefal.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/15252856442.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612659674c3c6---zixowedebijezaf.pdfIn PDF document text
    • http://camwater.org/media/files/37874171119.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/19059852490.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/76004832664.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/datemoxapufotizapuwoj.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210726172302.pdfIn PDF document text
    • http://vkts.se/userfiles/file/329350886.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/51508370120.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/sebojudono.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/4qfbosufsvdct2hcces7sgmgm4/30999966474.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/50291907765.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/xanunoxivap.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kumumibowuvomubefidit.pdfIn PDF document text
    • http://vswet.ru/f/38310707475.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/h61lehgs5aescptmjvi9hgkbre/96835214556.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/3523837080.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/memubamigosov.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 17268 bytes
SHA-256: c05afb3fd7899820e844d00f6d1e63d377916d24af5460069b2d01d719212e9a
font_02_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 10896 bytes
SHA-256: ad1e61bd5a354c70ba54ee34ceebec4f3cdc85c9c49a01f8fc80f3eeed1ed98c

Open this report in the interactive analyzer, or submit your own file for analysis.