Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f110fb4da1d5064…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 14:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b8912f5b63fd98a35947c43c83cc8cf SHA-1: d2f673c87c2d8e12d4ff53dbc4e4fdf6cc502843 SHA-256: 9f110fb4da1d50646bdc0499a17a4ef38df05321537dc185606b63296ff757ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=strip+poker+apk+free+download PDF link annotation
    • https://mimpishio2bet.net/contents/files/41593154170.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/gosunarogixatinaguzegovo.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/50467783376.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77dd05645---naxotobazumaxusizo.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/50665118070.pdfIn PDF document text
    • http://handgun.ee/media/file/65342629728.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/31939843837.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/wereti.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a9e37f2a6aa3602b052b83b071a0ee9/33443692548.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/femanutabilixalu.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/xuxumaxemesasi.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/30986157235.pdfIn PDF document text
    • http://guchen.ru/d/files/59861333825.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/27128232664.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/zaxipajela.pdfIn PDF document text
    • http://peoplefoster.com/pliki/44036897393.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/luguwumerope.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wenumorepegaxani.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/tlau8425cahd9ih12miedrfcb7/55011323712.pdfIn PDF document text
    • http://eternaseguros.net/files/files/75963299312.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/mupidozidazezizebadaf.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017e6483b5---fafadomaxonul.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_off0000c26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 16892 bytes
SHA-256: bcac43897add8b698d2b54c8bc0100f09cb8e2594120bc4f712cef51826c432d
font_02_sfnt_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 10576 bytes
SHA-256: 30c7bba92133d4938b19ca3889cd4d8c8c1bcdc47c3192b96cedfc221ed21f4f

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