Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b89f0f9fba822d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 12:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13c1bfe15f74e03f8909d7e9605230bf SHA-1: 2bf6e6f5b0823c3a069733fa67a0cb3a7799c31a SHA-256: e6b89f0f9fba822d7e1b402420304327f989c01e06b98615920b1d6b39783dbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://embody.box8websites.com/ckfinder/userfiles/files/52521269435.pdf In PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/miluzemuwarupafibuvov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e7fef4df---deriteluxiruzuvumanijilaz.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/26196976346.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hs4i5b68i01kpovpvmip0pf9bc/93196597403.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/72436062209.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/pelobomesobixetav.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/mufujowutajezajaluvaweti.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/duxonomulapududusazawuwej.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/39312505579.pdfIn PDF document text
    • https://yifff.se/userfiles/file/82990795152.pdfIn PDF document text
    • http://sbairs.com/datas/files/jiwapenuxakazakotafepoba.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/pexijanimizofujofu.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/60676427724.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/80200191444.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/76591520835.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348d8ea6577---fegivebojigaj.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133d77f1ef74---vegizurigakigumikujusobal.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/1663362573.pdfIn PDF document text
    • https://beaszemin.com/files/94378222506.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137c42cbdf8f---51348408580.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/povefuledate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+can+you+make+with+potatoes+in+minecraftPDF link annotation
    • 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_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 11084 bytes
SHA-256: f984618bb34e7bf8b0db98abb9a2d69cd46b2b68860a34e97dc1d28489b6456e
font_01_sfnt_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 17340 bytes
SHA-256: 1e9232abf7c57f0d0a71d9d3e9276be4f59851ecbafb6f9ec009f539b67ae4bb

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