Malicious PDF — malware analysis report

Static analysis result for SHA-256 620a866ef9e81267…

MALICIOUS

PDF

80.8 KB Created: 2021-07-08 06:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e28e5992f6501d69ddbbf33d41a6dcd0 SHA-1: 37fba2735abb23c4d88402552808916b9d6c1857 SHA-256: 620a866ef9e812679b203a73c97744fa53aff186de6c204e8eba88fb04100fb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=the+view+falmouth
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/43874843278.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a5913db5829d9b9a2eddc0ecf26c69f1/39453780335.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/44o09tv923uersga7uj11vpc46/luvemuvexoxet.pdf
    • https://loctra.net/userfiles/file/65816678671.pdf
    • http://strandedtattoo.net/file/69542052871.pdf
    • https://digireg.cz/upload/pajuxin.pdf
    • http://m-styleauto.com/js/upload/files/mesibejupupuge.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/58061624209.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/60518548891.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0a63e0ab---11419424704.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9bf9f5110971227d4621fcd85abfb82e/748350611.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a897e7bc2---vufifukosigirotivim.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9fec6c1a---lexirisurepesabixoj.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094668750e3e---52236479567.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988bd927e10---fesivobesuwebino.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/vte699epu731s5hno6p5ge2mag/gorujatezokor.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af58fca791c---legovezupefujidovadiveva.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ba3e59d83---kitifukejixagif.pdf
    • http://gdwtechnology.com/fckeditor/file/69151800340.pdf
    • https://pearproperties.in/userfiles/file/vevipik.pdf
    • http://stihoplet.by/upload/editor/files/wizotebezilexuzeze.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b6d6b7d9f---delotof.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf11627af---50623659812.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 16792 bytes
font_01_sfnt_off0000f1e8.bin
af8173a3934b0b2d21322834aca136b4575bebb07eb682afe5088cb1c93575ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 10320 bytes
font_02_sfnt_off0001093b.bin
90a4750df05bae9ec9200383f5c3b3e2de892d5c60113ee34168e782f114e0cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 17244 bytes