Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1135f518d26aa3…

MALICIOUS

PDF

84.1 KB Created: 2021-08-22 01:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d65f7efc0e699c5bddafc805d57b943 SHA-1: 00ea4d3db54fd583e9d4b230c8a0bb0bb7bc981f SHA-256: ee1135f518d26aa379a5f36626ce3db36f76ae5c8ce7c259c941ee693f20f6a3
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links indicate it's likely used as a lure to initiate a phishing attack or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/uplcv?utm_term=perritos+french+poodle+de+venta+en+ecuador PDF link annotation
    • http://kripasec.com/userfiles/file/zabuvewinevegovemaxa.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e0d7b8cf---53787377069.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/50390604699.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/56219946101.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161137762b98b6---xezazediginimuxizaruki.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ee4c59eb6c6b5c55a67412de27392806/punazamotidojerinarudu.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/65575374529.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/dekinewugetakuparipo.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a601bb31657---46674349642.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nonobirizazulofurope.pdfIn PDF document text
    • https://blogsma.com/files/zabovebamuno.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/44068683588.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/36519465280.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d0edac810---11241523433.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/midoxajad.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/43787997404.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7c04ce5c742097c314198dca26629a4a/33462997867.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f972bdea80---47339364858.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/sonalejaxopizuleduvujeta.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b203bedd155---21289677885.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/suferowimorusabu.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/xerega.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cdd566e986a671ba8efb874fe146a541/pitabaref.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/venepepunadab.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_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 18808 bytes
SHA-256: 758007fd42f61fe74169fb2afb397cc71cf9ddb24d854d6694313606a4e91cba
font_01_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 10884 bytes
SHA-256: 8c9bd6d5d148be933231412b0168b67ff545815176c4c65ebb1cdb007c661126
font_02_sfnt_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1