Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea7b11ff8d73bb1…

MALICIOUS

PDF

96.9 KB Created: 2021-09-17 18:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b775a2c2093e651db83b790e42a52aa4 SHA-1: 9a29e369b44f6baa91a5190937641ae36706231c SHA-256: bea7b11ff8d73bb146a16c6db98a745a078e998f6174dc5f7291c096c358cacd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised 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 likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://electric-kernbichler.at/wijusurexarezegotoxut.pdf In PDF document text
    • http://tko.wavedev.net/img/files/files/sezudep.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613679e11f24b---76491643703.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/86793946819.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/76949167180.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/tinob.pdfIn PDF document text
    • http://annabarons.com/files/files/95799963863.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/39055232445.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/pebevidirinitupubipop.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/94130775400.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144a35aafc29---masofufe.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f66c7511---matalutemikikuw.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/dodusajekot.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/15165793061.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/22971485302.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/65597492114.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/80664102659.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/vuxusabukagepajuxesowedi.pdfIn PDF document text
    • http://gameadvisers.com/js/new/fckeditor/userfiles/file/jemozenaxovovopa.pdfIn PDF document text
    • http://sireny.net/share/files/16118080946.pdfIn PDF document text
    • https://plasy.com/uploads/file/vulorag.pdfIn PDF document text
    • http://pk.mo/userfiles/file/87348828303.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/79451639459.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/79735418118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=last+blood+123moviesPDF 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_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FC 19628 bytes
SHA-256: abfece66f0ae0285ee3b236473cfedfd2efd4f3bee93466639056baa8f432296
font_02_sfnt_off00015db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB4 10712 bytes
SHA-256: dfda69fae403e7bda8d1072dc0fb6ae50fb9ab80205ed030cb498ad38fb6a670

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