Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4604f65880d86bb…

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 09:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad01c493382c82b3e9860d2333b0fd43 SHA-1: 74e54ef5759530a5e30643cf9652e982a95f8624 SHA-256: a4604f65880d86bbf1011fce2f4cefff2ade837b08b6118f5da548b5741e46a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://synerhu.ru/uplcv?utm_term=aws+big+data+architecture+pdf PDF link annotation
    • http://petra-dario.info/upload/datoteke/3438161102.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/48753203741.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/zalipobabapatasijuzata.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/og012bokkj0eh13r0i4dkgesjg/30012488242.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/xarowamanaviz.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/mobozedavanase.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd64c2e00e---zivabagizigorofo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076c811c3c00---wuwakufo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16072c56e807df---2228908199.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/11898227654.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eb881c8ca---zebezitazimomise.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1380f81ac50e55d175451f8f2a9a6187/wumemego.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oklpm3kj0u7pna1rp3kls6t704/40236073304.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/ziwotisosijenifuda.pdfIn PDF document text
    • http://amdind.com/userfiles/file/18619190351.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/97974036412.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/24737967484.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/s6k2l3vq2kng9gv7cr4nf9m00s/52276724522.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/dolobaruzasufemekaduj.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa85d9e7c---xerutuguxefa.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/98189395119.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/7rs1jlsvi9m0a3q30914kpju3q/61288107931.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zowatukipateku.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160847c1161b23---pivepasotomuluretafux.pdfIn PDF document text
    • http://guitarenko.fr/img/files/fuzonoxuxagewaxurapitusi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 16164 bytes
SHA-256: a29b536ab701e0f3a4d03943dd56dd4ec8b8c0d8b29b8e28b2448b9bd76a7e77
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 21276 bytes
SHA-256: 008fda80f8b3a28bdd5d1b81b031b43386da2aacd88409ac4abd49fdf607bf2d
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA6 10936 bytes
SHA-256: 3744489299a975275953b335a80aeed39fe84c0b531e9f04b5b03f3455af55db

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