Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8220989d074f3d4…

MALICIOUS

PDF

63.7 KB Created: 2021-09-01 15:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25a725d495fbc35083d1093ff0e43578 SHA-1: c37403e09a53886b9358f1b2e95929e8f1b53850 SHA-256: b8220989d074f3d49ff0447a91541803f5a2a587b10c9b9e04978ae6f8389448
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery mechanism. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=what+is+the+percentage+of+dissolved+oxygen+in+water PDF link annotation
    • http://the100voicesofgospel.de/fichiers/newsletter/file/57134805744.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c346b862fb---32328685758.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/gonalifapajedibolinove.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc79374894---14267157196.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/41185846781.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b946b67a948be7592f2f61e59bddc7b5/93607942627.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/24fdcb3f48f41b2d80ea0c1edfa91410/bojomexaxobon.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/vetefogasivadaji.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ba240c491---89148512930.pdfIn PDF document text
    • http://artospace.com/pics/file/bejesavedanejojarepega.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27882d2e8b---nutasu.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/zavinelezod.pdfIn PDF document text
    • http://roocenter.ru/upload/file/438364936.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105afea19ff3---notelomamibereletuv.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/24077010900.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/sodaxixibajubaxi.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/fubuvulalututapeg.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/wuzewasawisosad.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/kozudiw.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/73602312605.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a1a00b18520969c1a2a59a94d5d92360/70862501105.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/09edb8de3a6fe5c1bb753bb02d69d541/20486905862.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d668a76fd3a6b2b5ff48b40aad5fa2f1/74330539141.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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