Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d6e18f4ea8ca4d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 09:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ece26371b3e44b9e967d8d2548a0be56 SHA-1: 1a38c46b574270aef3aafa9bfda12eaf2efe5024 SHA-256: b3d6e18f4ea8ca4d03b439eb6a2e955a2253c129d2f062700f3495f3a631555e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous external URIs pointing to disposable hosting and compromised sites, likely intended to redirect users to phishing pages or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irlanc.ru/uplcv?utm_term=oreo+tv+app+apk PDF link annotation
    • http://netdepphunu.vn/images/userfiles/file/1431520761.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/85895004615.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/74941361168.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/78125135807.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/61903217972.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/boxuloma.pdfIn PDF document text
    • https://doitoutdoorz.com/file/cpkmKeqGDIoZyE7T.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/zugasoso.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/051859346d357a380f76a146b3552668/luwavi.pdfIn PDF document text
    • http://haki.vn/uploads/files/54005414452.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/59648023584.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c14ce987---95084143368.pdfIn PDF document text
    • https://macronew.com/upload/files/42184174791.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/zodavovenajebukaxuko.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/vimasuzesoperivefoziwupo.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/55290643402.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/jozeruguripegoxixu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130376b132a2---xelevunirim.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/vuwot.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/41628750657.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/funavisatogulujuzum.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/vukawi.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/lomikurivalularop.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/raretijopilosageduf.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16142dcfc48bda---52377878160.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_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 17932 bytes
SHA-256: 3ca6c731d14fd1c89610eae10b33dc3be1347b27d5c7362fff94ca1d477f102d
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 10016 bytes
SHA-256: 0416ef866c5705e95b6beaf16cb4c708a03fd797701220ed728fc3c5a3ca8d78

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