Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a92a5ea7064fca…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 15:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1bcb77f1c0973812265110565261f0fd SHA-1: 6de52ae3a226aaaec94ce36befb563ba7d8bbfcc SHA-256: 65a92a5ea7064fcaee4a7127d10e77844cd69c10dab84f3b6371ae9fac0a8f46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several pointing to compromised CMS uploads. The embedded JavaScript stream and ClamAV detection indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=coc+apk+mod+unlimited+everything+2021 PDF link annotation
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/de24a773ce4b90fb44ea0390d2eb9790/bexiripiwunigo.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/rudikuginegasilabe.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tegenukodowulasosi.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/6260333801.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/podimazago.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/xakerumelave.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/7101533640.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/musujewewidopikive.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/tevawa.pdfIn PDF document text
    • http://tcihk.com/userfiles/34228384172.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/20065510377.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137824074402---53965045169.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/gibatavatego.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4fb2ef92c346a42a0cc62fdc6ff3fcce/muwogulebo.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/dubokominudivefe.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/64355643919.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/dipusumunesega.pdfIn PDF document text
    • http://skomi.ru/img/files/file/zisidofujatuzowek.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/samuvutitegaforag.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/36288595596.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613324397f180---17633532031.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/detife.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a294e526---dirifasidotedujabi.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/turosujisifevifoxidu.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_off0000b253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB253 14832 bytes
SHA-256: 8d6c243647dde4f4e6e833b1c06d54ff9219f288874ffca27a6f1bb39e8e98f6
font_01_sfnt_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 11492 bytes
SHA-256: ebf078805824d0cd4348087e102d0a8f3b4cfae96cdb4e443ce8ac36fcba6a6f
font_02_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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