Malicious PDF — malware analysis report

Static analysis result for SHA-256 990bb571699cab41…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 18:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2088aceb5918f2eb30b4baa6cfeb5a1a SHA-1: d7b6552fb5e783c403f12f46c2b8db710fc03b53 SHA-256: 990bb571699cab4125492dbec9eb0cad2894e97ec60b84a21d2c22151359595c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories or are part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common method for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bjdfszwy.com/filespath/files/20210919190126.pdf In PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/bixoxetisaf.pdfIn PDF document text
    • http://annabarons.com/files/files/kolakilutumutunijo.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/2042502716.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/zadedifeg.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/68351730062.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/ruwejanudogiwero.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/nigaroxiwij.pdfIn PDF document text
    • http://skupka54.ru/upload/m/vilukerafomunexovapemibow.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/musepadafibufegumijes.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396d7f07965---12107780904.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/bemagilag.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62480324708.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0389bbbd---vedufujasagon.pdfIn PDF document text
    • http://drtamerturan.com/file/90522683543.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/kitanudu.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/27463226587.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/48450612383.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d322aed68---36801722120.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/506g9ned0rto531b27fpqivf3p/tifujulijetefesazaji.pdfIn PDF document text
    • http://specimport.by/files/files/pigokagopodasoba.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/12869433683.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/40053689778.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/tiwivavitamuvoguvutovomaw.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/tetij.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/nusokojoxovosilitek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+live+streaming+websites+for+sportsPDF 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_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 17476 bytes
SHA-256: 044af4dce53b5bea800ca0cb09b31bc91b199769cefe4f4b6a94d3f6f75cbdbd
font_01_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 10968 bytes
SHA-256: 78e85c852686bdcee40fa3dd8f9dbe651d1eff9f33dbdf00669d6c1a6de0a1cd
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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