Malicious PDF — malware analysis report

Static analysis result for SHA-256 5838c5468b1b0be6…

MALICIOUS

PDF

57.2 KB Created: 2021-10-03 17:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86591bd12606812061e6482afc35c91e SHA-1: bf29362ea73236ed4a6aecf3ecc4709d05fb5ab1 SHA-256: 5838c5468b1b0be6b9842becc803c3eabe5782c4bb9a3645d45307e056f91af4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress upload storage and other disposable hosting. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7984

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.
  • 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
  • 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://g4m3s-4p1-12s1.com/contents/files/laxisevomevufujomipigab.pdf
    • https://cancelaria.pl/galeria/file/32850609600.pdf
    • http://elementsgogreen.com/userfiles/file/7780514305.pdf
    • https://deltarealestate-eg.com/userfiles/file/12737108695.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/robokoseg.pdf
    • http://aaas.handyfriendship.com/upload/files/78835302318.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5ead2790---xubimotisonus.pdf
    • http://asvpp.fr/pdf/38758582420.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132295a2e677---72034084360.pdf
    • http://geometrabottero.it/userfiles/files/pisivurapulexitozo.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/roxezamukuw.pdf
    • http://itagqatar.zajeltel.com/itag/file/files/novizikavakawirenox.pdf
    • https://gujaratisamajparis.org/upload/files/rofexar.pdf
    • http://hejia-ele.net/upload/vixejobixasoferizag.pdf
    • http://telekommarketing.com/firme_data/files/86616255567.pdf
    • https://bednidhitraders.com/userfiles/file/71553463172.pdf
    • https://armenia4d.com/contents/files/80372829631.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137853ba6c61---zokiriwixodobi.pdf
    • http://emannsltd.com/userfiles/gorefulibitenesexu.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/59313815184.pdf
    • http://placc.info/up_image/gaxoxebosigeniwakelipofej.pdf
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/zimodupemoraxiwurexabawa.pdf
    • https://coonvalleycc.com/userfiles/file/kadoko.pdf
    • https://worldcastlive.com/userfiles/file/55038196680.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/01b66d9897f88ce98e5c491466b4b6b8/risugobod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+diamonds+in+mm2+2020
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b147.bin
db510588c26c6e515ad501d40f9e618ca18019eb807fd857af19110492cb291f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 16480 bytes

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