Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e145e59288f3f5b…

MALICIOUS

PDF

78.7 KB Created: 2021-08-21 03:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfe7f953a75a0ef5dc0d7343a2f9fb12 SHA-1: 58607d50d1fcbbc95be720e6a532d3261d7162ec SHA-256: 9e145e59288f3f5b33271f211a0d3da3d1c6e2edcaa9ac638295ed6fd711fd34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The embedded JavaScript likely serves to redirect the user to these malicious sites, which are designed to host phishing content or distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drapa-technika.cz/UserFiles/File/totitokiruvexe.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b54f63d6713e91a804d46fc994bb7ae4/36952291597.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd6d31bafc---14125074001.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1fdf1ef57---pepuxonizan.pdf
    • https://marljivo.hr/UserFiles/files/31377036574.pdf
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/juxurewebavek.pdf
    • http://ahcxdq.com/uploads/file/290051051568.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608477921cf09---dowarero.pdf
    • http://synfarm.com/upload/files/gasevesesizowubopufibuk.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef4729a7a---bipalumumorukigepexeperas.pdf
    • http://veronikavilla.hu/userfiles/file/97039895881.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/janabaloxodimavagaka.pdf
    • http://rheumatology.institute/upload/content/file/68701964319.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fe9hgfv2q75irbrlta5du6p4hu/takekeror.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/46458714146.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3208dec0b---91057284169.pdf
    • https://www.alitec.es/js/ckfinder/userfiles/files/1421641932.pdf
    • https://avgdesign.com/userfiles/file/94385746860.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ce236d207697bf32bcf1c1144012a0da/jipegojitaga.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2539828b4af3b5da09c1bdf26fde3c9d/61158873349.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b56472568b0b8ef042e36f8c5c943f80/luzola.pdf
    • https://lexconsulting.ro/webroot/files/media/pifufu.pdf
    • https://mertlakustika.cz/images/pages/file/somudegorologekenarefew.pdf
    • http://studionegro.net/userfiles/files/xedif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+were+the+economic+implications+of+british+rule+in+india
    • 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_off0000d07a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 16792 bytes
font_01_sfnt_off0000e891.bin
d43c559ac7de7c2630e7f3e601e1e0e3f9ae8ff9ff8d347a360808895171dec5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 11204 bytes
font_02_sfnt_off00010265.bin
8d88996bd46dc8dded30e978e6ac47fbf8763a0dfbb09192bc0d40f2a30a8ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 16232 bytes