Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fa3cd50ef7b028…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 11:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: adf326cc205ed4c53052814aec77d5f3 SHA-1: f839b914738674c073284da3988e1954a84f8b6e SHA-256: 56fa3cd50ef7b0287a996380cc1f30eb6cf06488917d1e4e192b5d03acbb93b9
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://abwmechanicsville.com/uploads/files/xijunepumizetemagobani.pdf In PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608264550ccc7---tonikunojut.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3432e2ca53acd0dffda27a53d6d0ad9e/tiravegijaxala.pdfIn PDF document text
    • http://merwepizza.com/upload/file/lomatam.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/74336968171.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2cd315fb6811fe866e96894f61a9c35c/xiwajogij.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/33d01ff5c75e37dbd7038e46b3e2661d/22249069954.pdfIn PDF document text
    • http://axwelindia.com/uploads/feworeje.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/97879147176.pdfIn PDF document text
    • https://jobtiara.com/files/files/52726498155.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/topagipus.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/lebifekenotigotadaju.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///povigudolanut.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f70ee0e20---9420565484.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0223bb9b79---tutirajakewe.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bieqfcidch3kds310gthijapp0/gofid.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/75378462658.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/narobowapifesofujulagima.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/2qi51mckicnej91r1g352re6d2/vazopupob.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/74ed80gqi80r79snu6mhmvffnn/82047178085.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/99006736428.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cf4b40ebf---78689009563.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/58602188172.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/913aa55fe8f0c0a7de77dbf785e94ce9/pufuwagakufuru.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9rvg5iqendvoqthbfb5a3u1rmn/dawadetesokipage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=uv+1800+spectrophotometer+manualPDF link annotation
    • 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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 11104 bytes
SHA-256: 3905b28d075d9f044d682aad8897f0948c6fabe48c5a89850ba6c4c58888b05f
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 18476 bytes
SHA-256: 98e678634e2e5dfeabbf9e5fab821ba72a96aa2b162e52bc07bfe70b747081c2
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1