Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a96cb4f5a1d96e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 02:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2654d920a61bc8e4939b4d9aa794366b SHA-1: aea44ba2b03596a6e0ea65b50106751fb6f6e7e5 SHA-256: e3a96cb4f5a1d96eb039e0f0759bd6b853ea07008e35a7a6356d8acc55f48cd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads 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 0.9974

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 http://garage-fuji.jp/js/upload/files/27932884900.pdf In PDF document text
    • http://phatnang.com/media/ftp/file/dabodazuvibigafiduroxa.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/netiguzadudetugolesasamox.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/vikemizinuv.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/4544857644.pdfIn PDF document text
    • http://gtshotel.it/images/file/mimux.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/57610313396.pdfIn PDF document text
    • http://demkapi.com/resimler/files/muvafo.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/rubudadodag.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/pdsq914m31l6mp4i4738g474nc/dowiwozizixiloxizam.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/memugodixosevuveruji.pdfIn PDF document text
    • http://capableapp.com/uploads/files/43963152827.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/51953155596.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/16391590445.pdfIn PDF document text
    • http://artio.pl/files/files/41758298367.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134844f592f3---19936723186.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f1e3463ed7b2716c90586d49faff56d2/17224433014.pdfIn PDF document text
    • https://suncables.co/images/file/rigat.pdfIn PDF document text
    • https://rajakedua.com/contents/files/88599000702.pdfIn PDF document text
    • https://rcot.org/userfiles/file/gisezem.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/55570880184.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee43ea2f48---nukufuvegazotiva.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/zijuxunijapoxedapipewajap.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/neruteloriwarurafas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wonder+woman+2+watch+freePDF 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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10636 bytes
SHA-256: 8cf9dc55034da87e2d5b37f8045e24f2663ae4c905bea17ce0fc42afea925616
font_01_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 17820 bytes
SHA-256: f84d6c2b70c6b6bcf8950cc947668858ecdddd1ded1b7597c3fbe4b47fbd31b0
font_02_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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