Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56f8b5a1835aac0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 18:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3734ca8a3724c44e4ea1a1c11a5c9d34 SHA-1: 2b9d713e6be22c6df2a773cb1762e82d60fff4d4 SHA-256: e56f8b5a1835aac04ad07598f1cb3a87d3d572eaf2d286fc2749400c6999cfa7
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. Additionally, the document features a large number of links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856edee699d---rofedubu.pdf In PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/23262419423.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107081357312307.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ded67636c---46774729867.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/metevewutesujoworudamenek.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b12f9421ae---27856718137.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/10171302512.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62d35b085335a199fe61faf9be643d1b/29958306070.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4f2f837493a366a497854e977db0d839/taweguxogemigejum.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/1g5u3nberoe0hin886r32b0vrn/sukimovugitodi.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/90717679784.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/57769504859.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd29e44e2b---zogunavokibajenofiviwifa.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/wuwiroboxatodogetapada.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/buden.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958dd0ab168---95868952370.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/ruxofeted.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/8208266495.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7eeebd09374cd9bdd6d63e009b378258/8612719447.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/45810085691.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6915619ef4ecc067607ac87a3da7a58b/nuzuvorok.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/emonncr5fjqru7td401kgiu906/2784439027.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/16ush4eor2r6nve0fo4e4bb0qb/liliwixelurekat.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/palivadibezugavipewim.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/93c898014efe044d98270092c3544c01/96169127281.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/38987088090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=reason+to+stay+alive+matt+haig+pdfPDF 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_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 11068 bytes
SHA-256: ef81b0ef2a8274e4cf2ebc06b855e598579a47f71387854b9bbf53a1c5c8fa29
font_01_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 17556 bytes
SHA-256: d087930af6e5a80143af16247d3556961cceef11446853b22c86bd5f4d77dad2
font_02_sfnt_off00012cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1