Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98dec5ad55e959e…

MALICIOUS

PDF

89.7 KB Created: 2021-08-30 01:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54faa0946be81fd98e0dc3a02a7f8bff SHA-1: 0b9bfa5ebb330bc05c687450141fb156a809fb30 SHA-256: b98dec5ad55e959e564d04e2f486538371c1b97a9c45f7c64403d2fffcd91b3a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple links pointing to compromised WordPress upload directories suggests an attempt to host and distribute further malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan, reinforcing the malicious nature of the sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/fab0d7bc88807ffde71defa9924bcd3f/35335196975.pdf In PDF document text
    • http://clarksville.net/wysiwygfiles/file/rakojax.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ojudatq85r8a1ojrt90psbsq90/xilowi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/520d85b057eb88b93f48e4c0c0b8cc94/93887692753.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fa9be905b972d02b26b9492e24e77e02/pozovugebujojifanamevojek.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/25409751590.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/tunaxowi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/nobopar.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/78851584786.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae90672e8---84478240012.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/ninuw.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/59419761108.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160906c2aca8e8---xujoberexoduberi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/samowawipukuxonerid.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/tonuvuvedutapadomojiv.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/95418278230.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/wovep.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/sivutodorilebunit.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f448946731---21681110828.pdfIn PDF document text
    • https://ecoretras.com/file/zasegowimekimif.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16097d6311eef3---tudujukapulasesekik.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/27e3acbb83090fff2e7dae10d8ffd23f/85271336427.pdfIn PDF document text
    • https://fasaac.org/temp//files/ponibosoporizademobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=olympiad+books+for+class+2+free+download+pdfPDF 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_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 19852 bytes
SHA-256: f956f2d8e773db111a2330a8e971ec1fcc08c16b72823a68a37bf2948861a7ae
font_01_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 11260 bytes
SHA-256: 58f8dcfe36a76e98caa057f3ea4c3f21990ce1885f76856cc509961183116c3a
font_02_sfnt_off00014186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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