Malicious PDF — malware analysis report

Static analysis result for SHA-256 e664f3377f4679d4…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 15:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9adb878b1cb83bc497bb6262789f2e5 SHA-1: d19ce894eecb0bf9f18da4d6731164ec62dd7fdb SHA-256: e664f3377f4679d4a39b18afd3357d48f15455413a30c03556e0688fcaccebd2
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, suggesting it's part of a phishing or malware distribution campaign. The 'Browser extension / update installation lure' heuristic strongly indicates a social-engineering attempt to trick the user into executing malicious code or downloading further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://tradeweb.es/userfiles/file/zonisabalasezonofozi.pdf In PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/laruda.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/puvivopupi.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/repewamokosutoboviraniwa.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/zararenuregive.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/29502877250.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vjttf85heuh0n9if40mb75m9bi/pomerisezipeb.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/90874684547.pdfIn PDF document text
    • https://led7.ru/file/nasezebozazijubexub.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/22032521460c2b76522847.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/6p0sm9rftr75schu85e808vm4q/sanogitufox.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/vozibawakarikikobo.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/wagewonojulomiw.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1817356bb---rumufixomezotasalixiri.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/69817788612.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f6a9ce5c834308f422f62ee10b74d132/vuxakomokidepefibagupasut.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/p53c1e2rm48s15hc8nmfvfuk9s/tutuduxewesafabivup.pdfIn PDF document text
    • http://lucann.com/Upload/file/10983208787.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210707145954_104kpg.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/sipajofazexijizisaw.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/witomevifebaliz.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210829042944.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/luvowiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=reduce+pdf+size+upto+100+kb+onlinePDF 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_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 17460 bytes
SHA-256: ad71f13adc938e6f0d6b3dbdcf216aa4b98f14b5e3b5fdf2fc3f2b881f1e1ddc
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 10964 bytes
SHA-256: 4f91fc2f384ff6c58da418a92379dbcf7a336c1f28931074bf109d92c0e4425b
font_02_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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