Malicious PDF — malware analysis report

Static analysis result for SHA-256 132a181e9c971d49…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 15:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9f61bd2daa21a846a22374e4c29cbfd SHA-1: f4765f668c3cefc8985d9172d40f9ef999d0ccc1 SHA-256: 132a181e9c971d497166f61d2a7b03251383113f5a38c33fd1ae41f4e48c5718
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites 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 distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://drafthe.ru/uplcv?utm_term=android+porn+games+for+free
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210913021158704770six4iv.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ah4chpd7cu7ibajsu84fhaea34/kowumutiwokekasosap.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/88935669578.pdf
    • http://salsainkonstanz.de/media/files/9448012969.pdf
    • http://kaupa.cz/userfiles/file/ledopobotuluz.pdf
    • http://huemin.com/fckeditor/userfiles/file/powiremil.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e7bc73d45ab568b70ad845bb83da568f/xefaxosenamun.pdf
    • http://www.hgbehringer.de/img/files/files/fanujagaw.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/pomapuwixosopelawap.pdf
    • http://studio-orlandini.com/userfiles/files/vutiv.pdf
    • http://dtmaso.com/public_html/Imagens/file/jusikokosogezisunuzi.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e11c726316---37957893669.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613153dbcdc02---wabomowogakuka.pdf
    • http://1666-3668.com/attach/userfiles/file/mixeriwamoso.pdf
    • http://ctcinsulator.com/uploads/file/dalogedesupogew.pdf
    • https://mondoaudio.it/img/uploaded/file/tabijuzazagufolipataxi.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/60264609510.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2esgh2s4sjr9rkhcvkr1uoi10c/nuzupob.pdf
    • https://egokituz.org/files/galeria/files/sovapejozedojudafutuxugin.pdf
    • https://gkatsov.com/userfiles/file/podimijirijajinufusedebu.pdf
    • http://355353.ru/userfiles/file/zozabekilominabibisex.pdf
    • http://belovosushi.ru/files/xelikem.pdf
    • https://506hlapeta.com/files/file/guzefen.pdf
    • https://pomtco.com/technical/files/file/62503497919.pdf
    • http://coeb.eu/userfiles/files/98885270006.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16792 bytes
font_01_sfnt_off0001057e.bin
180985e2d6a2a87929af30267d0155e4ac6395c2eefae1e290071d0ecb63aefe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10676 bytes
font_02_sfnt_off00011db4.bin
758f6ad14821254c22860b08d4ea61b93243acc4f685fd2680990174bf277df0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 17172 bytes