Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1222325fb562be…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 11:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: defd72b056b2c1fc2b94ee009da68fa7 SHA-1: 61fb429ba96b8bfa03d9a6bfdddd895574122fd7 SHA-256: 2e1222325fb562be1c25c9afb67681537d9df431755f2e553ff6810cd6d4af1f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and disposable hosting domains, indicating an attempt to deliver malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://barcelona-health.com/files/galeria/files/84864280426.pdf In PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/98633084748.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a520cf2a---gawororitef.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/gajuwuwumetur.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/62268280428.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210911175709_fod8v0.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/gafeneduzibosofufarigaw.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/larujefasajuram.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/kujepetetepezesidabog.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/dowarudaravatetuxetedew.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/ramekinupakirukugun.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/visedakowovedagegewawup.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140a76e03e91---43330030846.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/jaluzevi.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/33081554311.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/wubewetu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3eae4b198---89842105847.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210902_5FB7364B44F61B9C.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/20407347921.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/gefodijogos.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/11994945707.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/48772120632.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/doginutap.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210917053004.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/27404939488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=engineering+physics+book+pdf+free+downloadPDF 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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 11216 bytes
SHA-256: 9ba78a5bf24310cd180f753ad942d7b6359dbfab4062b6f4d9380f3275bc0e94
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 18076 bytes
SHA-256: bb0049fd8d9b1171928beb620994a14eca4e229a0b4ad35c047ddab1ba66f94a
font_02_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1