Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8e252ce6409e95…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 09:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30c33ae13eb9760072857a9942588df0 SHA-1: d5bcec84bc4b720d678a0ee2e52b5e04b313df01 SHA-256: 3e8e252ce6409e957334ec7b5c6cad131c35a3cc15abc79a671f710ae5399f2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tucarrorentacar.co/ckfinder/userfiles/files/82469629003.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160977ca28f88f---6261480906.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/kijesijutulazisu.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f46133e4a23d2a046d797b36cf983125/zefapukomibonofifobu.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/49515400048.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/dh319nnmvv4ih7pb2gar2n0kb9/49564601315.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c485a8d990---77507569239.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/6gaagb6kuigctgmfco3qh2vsm4/44298535650.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4d2339e121bf71f94b785c65160716ec/xesaluwojulawowu.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f333086019651950daa7f766a2e8b195/nitulaw.pdf
    • http://lnaixi.com/userfiles/file/20210620161756_1304584067.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c88510d876---86043539019.pdf
    • https://clinicscrm.com/img/files/24994621356.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/89258154936.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/19367160064.pdf
    • https://traffictkt.com/viking1/uploads/files/dowolesozavevun.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dt9ocacmuja8gaq743akuuuqn2/nexed.pdf
    • http://ahkjt.com/upfile/file/81593723848.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/236cd52c992679c1ede98ad6ff77c78a/60749823551.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/kulige.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ac12d873ecc597c412809025db4b7cf5/34718219147.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a780ded10a8---febajefutolojixi.pdf
    • http://taskentcompany.com/userfiles/file/xakejuvogomodogusesunuj.pdf
    • http://vivaibonomo.it/userfiles/files/totemusemon.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafbaa2274---78277121970.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=eight+of+wands+and+three+of+pentacles
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 16792 bytes
font_01_sfnt_off000103c7.bin
830c68f2f841d3908517009c37852cf23f7c7062ca96a194b3cd3b134c843528
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 17104 bytes
font_02_sfnt_off00013042.bin
5078ef400d3e2f0e3f5b6164d3c0130840626f1a37ff74b7ec1dbb8a0172bde7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13042 10968 bytes