Malicious PDF — malware analysis report

Static analysis result for SHA-256 1924367ad23388db…

MALICIOUS

PDF

92.4 KB Created: 2021-08-11 21:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94d69825b6be050c92079c01b0787758 SHA-1: b9e94f3a5077e5207524ca074a87772e0ebed0c3 SHA-256: 1924367ad23388dbc3333faf4575049b274324459097e9cc7293554d4ac5facf
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, and exhibits characteristics of a social-engineering lure. The document directs the user to install a browser extension or update, a common tactic to facilitate malware installation or credential theft. Multiple external URLs are present, some hosted on compromised CMS platforms, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=vce+player+crack+2.6.1 PDF link annotation
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3955imjl3l58vebdq2hjur5fir/remewedifuzal.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021773500.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bff87b70c---kojenaxixus.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3u189ah2n45dc17qpco7bli7q4/fulefavav.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b03716a4ff5---28746745054.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6salpva2ua8rdtuqo4ctlrp240/73614705582.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fffb13bcdf4e80c672bb608792dc3c40/1844198648.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/56b52ba1dc4abc809816b77868c558ae/davakura.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/tedumelisigaxigazoji.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/ef2c94e26e1dc2d6d6fb03b37ae9c23b.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/19692003682.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/libuvozi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca02370f8c4---muzedijobuxenajotasuzifum.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5650e945---49511516694.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/818cddaebb4870e150f88e7358c64c2d/tupajofivetefudasonimaxe.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c92da55e11f8c688189724d550dbe43a/22327142018.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/28932061254.pdfIn PDF document text
    • https://zzhqhi.com/d/files/78744637500.pdfIn PDF document text
    • http://chieucoingason.vn/files/90571527244.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca507c6c95---26625108878.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s9l3vkkgqg2qljmgh0e0jste62/zevamadiku.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160759cb841ed8---67021504433.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e3302f29b2d6b438d835c454d3d3e61e/89420258859.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ff3d010e7f5df0f7c3a1c06df6b472ad/sasidolejofevuduki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 10364 bytes
SHA-256: e4a2614d166eaf7561a4610e2596a27d6fb7b530d313cb3723f19b658dd191ee
font_01_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 17676 bytes
SHA-256: e80fb35d1f67a41356ec6721387cef4e7b6234ac27e7a33abbd681ca13f4dafa

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