Malicious PDF — malware analysis report

Static analysis result for SHA-256 066990b97683d879…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 21:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5e142ef299fde876905692f0be115af SHA-1: 7099f1bef7ca50e123cdaedc2abb1de875ba4284 SHA-256: 066990b97683d8796bc6b61547da15ef5dfdff791c4697ad05f0107d497de506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, such as https://irlanc.ru/uplcv?utm_term=data+usage+on+android+phones. The presence of external URIs and a link farm structure suggests an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 https://irlanc.ru/uplcv?utm_term=data+usage+on+android+phones PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/30s7ckkud75h9vp2s3jkkqhf5s/258638748.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/lubeva.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/18382946025.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/nipenejapa.pdfIn PDF document text
    • https://manenshop.com/upload/files/napidenubetodixojuma.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/kejurufadutozo.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/pifapigafopituvuv.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/29264234157.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/85725160118.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/kegorixejorowuzidu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/9009805774.pdfIn PDF document text
    • http://tai-group.com/upload/files/pezudeduvajiporot.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143765da13ab---33764683250.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161459e8c1fdf8---nuzupimatomijodopanunes.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/jukujiwoxesuwurovizebe.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/8530758193.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/dowipudaneditabivum.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/zasimax.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/22118887728.pdfIn PDF document text
    • http://huefpdf.org/upload/file/39048453228.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/xifugud.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/20576116525.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/69768109842.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/sifirelotizewitevujet.pdfIn PDF document text
    • 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_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 10728 bytes
SHA-256: c2dc9b9c577a1caa6fcc9a01f76deb3c4871e5a8150fa58e9c1a107630a35f0f
font_02_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 17620 bytes
SHA-256: 59531bcd230e51c94fa3879f4aeb88fb7ee3db72d06bb0f40a23038787be4bdc

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