Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb3fb4e2af2165a…

MALICIOUS

PDF

164.9 KB Created: 2021-06-29 02:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 011f083622695ffde0252a61c39c4788 SHA-1: 9450000fb1776a760e4a6db2b4265d5a0e878c32 SHA-256: 8bb3fb4e2af2165ac4d918875202dae1f2356c560fad73fcf26898f28e54c1cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a0829b76a97d4e3e2fa9e6e13fefc5ca/pupolaveropadatu.pdf In PDF document text
    • https://bursakaynak.com/userfiles/file/16534198045.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/fatifilevujenivizetuw.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/60619073273.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/dobubexinusexazawivuwate.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/tomonolonutoju.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7927a72a0---dijirulomigug.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607addb736791---xuribigimujudawoxoxewi.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/81082516391.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/kagimelurexep.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf762b4c1d---22878682013.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/15494885526.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/76934702056.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3c37571e3dbb001b5fde75c5eec7129b/11241321565.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0af55312---febalozapizirogaxotuxo.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/8918637620.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m7pqb7irnu8k06cq1njfimsk76/45313006916.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/11109541349.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bee524bea---suzufukavale.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/56966531367.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5a8a89d0a94a95a1567333cd85da9d5d/pojomimapegux.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/856c9b7bdcc31b365016e9a031b4e749/95418462339.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/44593887598.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/59480846984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+level+up+fast+in+persona+3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E924 18084 bytes
SHA-256: 23d930b9ae5054677fa5fe7fcd77c58274a87b76d8d103ab5c83492c963f55b2
font_01_sfnt_off00021872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23089 10768 bytes
SHA-256: a2ee14fb36f8175da09c3dfa18f21ad127d9662ea673f261c90ef5de63c4248f
font_03_sfnt_off00024977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24977 20232 bytes
SHA-256: fb79c5b087b7b861b140775cd92db781f6a806ba0ff01c0108d2d0947aa4c730

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