Malicious PDF — malware analysis report

Static analysis result for SHA-256 49449a3d46d1d94f…

MALICIOUS

PDF

87.4 KB Created: 2021-08-16 14:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f78c28de033b576729d7d74c5a801334 SHA-1: fb0b221de9d7699b13c35475663bfd47dc8b5c79 SHA-256: 49449a3d46d1d94f033acf33e552ca68272f27422b9dd136142572d60df71cc5
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The primary function appears to be redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://studiozammuner.eu/userfiles/files/67850959925.pdf In PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/nibevisitimarili.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d86f764c766---74367503608.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/36741894659.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/36350942647.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/jajobewixukisiw.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/77722634734.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b00f35efe---xoletedekakosu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9f6966572---kelozazegefij.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/41628209279.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0917d56128a1ec52798ae8b52e18ad26/79794434821.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ec880b24e049b352bddab6ee3a927b7a/17465789485.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/76706637913.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/faladurisulajufefonoj.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608001fd25140---miwagumivotosurog.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/85778202326.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0nnco6n4qu1th084ujc1r6089g/lonetajesorigewebasotegep.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/sosunutufimiwowewav.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/lelonix.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c520c2d7d9a---kugitopa.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/27455840390.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760528e3e3b---faxunonav.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdeef0c2d---kunudezewidodefizur.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/wewunajenamudununomet.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be34c8cb6e---81314730822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=reading+comprehension+practice+for+grade+9PDF link annotation
    • 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
stream_007_off00012bfb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BFB 16388 bytes
SHA-256: 6d71bf6a452de5698166c84343b8e1a248e7de4956522a088ed994c6b23e9e00
font_00_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 11232 bytes
SHA-256: da0bc2bedc1299cc70e7f1dea176eb41fd7bbd4cbc74ac0a4eeae3c236a4d404

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