Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f620941a0722a11…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 15:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b8975c5ec919d4518bf801a6fe309bca SHA-1: 8f793e0fd2ff36be63162ed38c66cc5f6318d313 SHA-256: 5f620941a0722a1132f9158d659367425c8c1b3a5ed49a40445690eaabd9787c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://newsale.linyn.mobi/upload/ckeditor/pages/files/noxefisovejad.pdf In PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/kutodevuzasonoxude.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/mavodanosatosa.pdfIn PDF document text
    • https://akconta.com/uploads/files/bejomuvulaxexufarab.pdfIn PDF document text
    • https://bor-diing.com/upload/files/72680718751.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/64062ecad7b19aca043bbdbc5d893733/3910404740.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/90087420205.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/tekapuzijamafokaxevejava.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/vowarifirizuzuv.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/25709132635.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/r15rfpeaj0osut0c8qncedp6o4/tibolegixada.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/30791376491.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/20151743610.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/50469269439.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/79329927778.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/bizusorarafizobapomotug.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/83277738367.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c828e9206c72da64a103e89798f715db/44389881486.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912002327.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109090010026982.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/42336348450.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8249cc9d1---68149516182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=random+fortnite+skin+generator+2021PDF 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_off0000b11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11C 11080 bytes
SHA-256: 7a85697626506b02f88cbdf85d2c33b728e77f1c360e8a4c694bd95c34e2d967
font_01_sfnt_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 15248 bytes
SHA-256: cf809be9fc1631de2c7f8201adb98bca32a653350f87da10d1121fd348cfe3d8
font_02_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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