Malicious PDF — malware analysis report

Static analysis result for SHA-256 3040152fc5cb5985…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 03:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2f603cd01bb7109b235d37263f87c3e7 SHA-1: c51934f259576b9bd084d567083579dbc1073f37 SHA-256: 3040152fc5cb5985184421ebd45ebc17b67b57b3d7b2d1287636e84c7d9468d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and link farm suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=round+house+fremantle PDF link annotation
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/goxepotivorexusisun.pdfIn PDF document text
    • http://nature-revive.org/files/file/xovunum.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/biwizifutagipasol.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/jivetixute.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/lubijesarafevurejenukev.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/morotolatizosunize.pdfIn PDF document text
    • http://whitesal.com/data/images/file/4052_20210901164519.pdfIn PDF document text
    • http://www.moyekolodin.com/files/48677510791.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/lujuvunamenowa.pdfIn PDF document text
    • http://iucecb.com/files/file/rakosusizul.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/sikuzoj.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/51431903855.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/xovok.pdfIn PDF document text
    • http://osayit.com/images/file/12885990846.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/xuxanubexodazazupuxuf.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430f9954c50---45628410384.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39b58e3e8---bojokamejurujukusisanup.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/wilatusipofolux.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/2955308121.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/38587579458.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/lawenapaxizokute.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1b804315846a68e20a20e3adef4dcec8/10692211395.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/sutivuvutil.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/weniwaxovufiwu.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/36471721469.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vimudemuwuvexaruxopilo.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/bovumipogipu.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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10672 bytes
SHA-256: 43217231d4bae47055db70132f35a14f13241b8a0d15f50f7453afdc6a7ccbc7
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 18776 bytes
SHA-256: 5b800d019088a48cb26958ddc37ea5389120ea605b88499bafdcd7e8152a7823
font_02_sfnt_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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