Malicious PDF — malware analysis report

Static analysis result for SHA-256 7494ce2a6a2a45de…

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 08:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87b2054369f6def23289c663e4dc657a SHA-1: 0fc8219d4be6f83432eb15e007f106c963a3620a SHA-256: 7494ce2a6a2a45deebf6adb5c7aab3b8a521c5faae750abf881f27c3ecef8899
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.bash.cl/media/file/51513427641.pdf In PDF document text
    • https://ratsimae.ee/media/contents/file/49488815829.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/7784905757.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/37119202763.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/jijolukixazojosetezedorid.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202108191935258582.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/xavozogovuweguxulazebogi.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210629065339.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8bbbe0bc2cc5a02b4fff6a53ab9cee48/mebujejibebuvefume.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/rizolalaguretidoxibuto.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161282c2880a89---38462383863.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e06be07c6---rovoxaziwujafitejof.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/xukemamuwutuxijikofa.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/zanadatisoxu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/8f84ef7891f39oepu6706l4i1j/bisejezapekevopu.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/84151909100.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/94151078070.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/98324064832.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/damufowuwidol.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/83568158341.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715521efbc7---19985512651.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/72825595773.pdfIn PDF document text
    • http://amandamaitland.com/images/file/54777457320.pdfIn PDF document text
    • http://esistore.de/userfiles/file/45863070953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sansui+5000a+service+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_off0000b8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AE 10672 bytes
SHA-256: 8c53653000fa459d9535be3dbc76c9c1f268e8f23ef4e7de755a1cde72c00297
font_01_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16120 bytes
SHA-256: f1fd28b10fa3b72595fb07aeceb26131b95b6ee3f2b676bbc8ae86c2a16103f7
font_02_sfnt_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1