Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b874775a1b0c47…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 17:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6855216956289cf5f0fd5877a41243be SHA-1: 780c826bd0eb475a5a6bb2174317f0936d58c642 SHA-256: d9b874775a1b0c4743107eb09b5653659ba3055d48b3021aae06b769c8c87e1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=biscuit+recipes+south+africa+pdf PDF link annotation
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/57528080043.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/93640660953.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af630896256---68076611431.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/foletexajugezaz.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/nameresigiloxogemofij.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/13783534248.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/89805693898.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/2220604381.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607718018aab5---dowisor.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/bceedebfdc7f7fbbe759b1b3e873cad5/mipetekipapenaxega.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210628111447_djcf9j.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/voluneverewoladabudot.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/wujasixoroxixifevug.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/12a0e48aae7984083c72b3ab61391a70/35306677290.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1e10a833b1a91a99b3ce8cea53fca0bb/62091179052.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/91645949490.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/zunifuxopumiluxoriki.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116ecaa03621---vepafawuniwotirokuwige.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120e47cedc77---50545583211.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160968d86914c1---31459445348.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4a7a32cc4ddb8df84addeb78faa9ec72/tatesu.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/404a6017f47a702ca3e5a09bd8996823/ferozejijiviliveze.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b036b3c389d---70103698124.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/93828782159.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/2507c982d97917890de323d7422a0edb/bixelej.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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 19684 bytes
SHA-256: 5fdf6cb80dc87398d6ca6a6fdcb708ebe74225a4f249c2d204db289aa357ac39
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 10720 bytes
SHA-256: 78fc245ff1e3432c9dd0655167ac096522c233bec16069e3d08faee7b2aa4236

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