Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be2b13ae753a035…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 18:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c543951fbeea9076fef1c85db1fd6b1 SHA-1: ee2dbbc30696f80f413c5e2c4f4d68a81bb6429b SHA-256: 2be2b13ae753a035d1327a3d48a107b50ff009a3289184bf70a3904f48cc639f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised upload storage or disposable hosting, indicative of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=fast+and+furious+9+mp4+full+movie+download PDF link annotation
    • http://ukwoodrecycling.com/userfiles/files/82189535211.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/xinadogukedaburamekogu.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/jejipevu.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/febitojapetux.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/novakabopubir.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/tovumitumefasereme.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/zakekawadonuxakafi.pdfIn PDF document text
    • https://mangallagn.com/images/file/xuladafet.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/65736838445.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b57ea846bb---90496333156.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/29922108279.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/87188526859.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/rolefojulizepijodegebupe.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/46801358545.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zapozudifolamokevilu.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/wozitakenovuzog.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/misuzu.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/30738474447.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/fiviwe.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/rogunirezirivitu.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/26171426343.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96e1af075---tonapimusetedekivepilewu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lc3pelb1864qa68fdteom86e50/25791766655.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e7ff2150---54351138103.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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 18924 bytes
SHA-256: b8966f3d3835273871fe6ce41ce67dd0c60dae94d5ad051f731700a4b940adb2
font_01_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 11132 bytes
SHA-256: 5d266e454e83e761ac0edc3d08ed00c55e069a8aa12c7a5fefc4a9422acc0540
font_02_sfnt_off00013151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1