Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c4cfd3397c0a89…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 11:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e489e159122b7619dd103d9f0fb7b66b SHA-1: 7fa508b614dab776bb6bbfc105f823bd867cfd67 SHA-256: c3c4cfd3397c0a8940db4dd7916cb6d2863a699b5fca52f939bfa3a1981e42fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the primary function is to act as a lure to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=aptitude+test+sample+papers+with+answers+pdf PDF link annotation
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cecbf4c039---fototemewo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/98497757735.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3901fc7422a3e7a113a2e8f67e7a4c2/mosixudagubelapelinada.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/turem.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/be83f86f6ee95ab54a34e8d9a89f82b9/49448711214.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088de868edec---wumukamuvositipumezomere.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/33166249130.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/88348339076.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/5ib48o02cof4gk6ushkl45pl5p/wugomuwurusamepefizu.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/55f8d00996b83ece60234adf17f5c29e/gokagajokor.pdfIn PDF document text
    • https://appfacile.it/file/56624138897.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b171d3ca678---nagekitanelupetabasu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21c170531---nugomafejivez.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/biwokamaxi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9ab8c894535a2689139ed4afaefe025a/bapaxijamajalofifol.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/dcd138453543de5555b2b1a677722e13/27735003790.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/98423233925.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/23746935553.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/09a15e2f22f18b131924cb599b91a30d/43731198403.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/896a1ec92ecaaacde582ad1d3cfbc234/57450442491.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8377a111e---gifanobevubulitegom.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f886ebba0c---72792921422.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ac4659ca6e8415281facad5f6fbafc2f/92375170104.pdfIn PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/56258929583.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608497af90123---lulomafibete.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_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 17888 bytes
SHA-256: 89f114cc8092a2d9d4b7ac9b1a5bffd3640647a8b896b0b919552bf3c97e3c59
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 10812 bytes
SHA-256: 796798f2c0aa19534195e5249f75a71beca3413357884e0e2686cdd26fc80b04

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