Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b1121f8192dd9b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 16:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: faf6e692aac7709b2c42569be313dba4 SHA-1: cb342d0ffba178808190029ccca495a9df79ebbd SHA-256: a9b1121f8192dd9b90d3ae01d83c8e4b1c056776154c051f660c71ec1b30d983
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. ClamAV identified this as a phishing trojan, and the ML classifier strongly agreed. The embedded JavaScript likely facilitates redirection to malicious sites, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

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://infrive.ru/uplcv?utm_term=inmunidad+activa+y+pasiva+pdf PDF link annotation
    • http://mmbc.cz/_data/user_files/file/rubusomokapudij.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/66000194646.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/23863579867.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/73758280440.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/waxejoxelilabokoxeselamaw.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/57513934960.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/gelejokibuxa.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7d0b7523cf9158069c12b99c131c971d/vajexitilamozidafadub.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614149ca7f8a5---suvix.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/susugirusuromiwep.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/88376490679.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/61209349847.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/9336557361.pdfIn PDF document text
    • http://labonscafe.com/userfiles/zagisol.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/13616784598.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe69b966bc---20695125335.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4a493842---tikewivaxelikupumuzeju.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/vimukefefu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/20901846597.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/tebon.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/gijixamiwibasajadavuken.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210913165013758174dzbhm.pdfIn PDF document text
    • http://lejuriste.ru/files/file/82090688265.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bulefalazobidasi.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_off0000bc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 16048 bytes
SHA-256: 2f49c3f5c710d73b57210d2b909ff665af84621790b6f81d7ee4e0bb6837e3a1
font_02_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10616 bytes
SHA-256: 67bfa2c33499c596f8fe681b649632a30969a17d59ec50fdf9cf6ce8bbf30611

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