Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2c291a0dbff387…

MALICIOUS

PDF

61.6 KB Created: 2021-09-07 10:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e445bf89b8cac8ac8fccf6904b3da565 SHA-1: d96df1f4f9cfd4717caffa1a50cc16cc4f539afe SHA-256: 8b2c291a0dbff3877f5feb359cc88bb4ba7ebca0a17f2d280ff4b761fa03abea
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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.
  • 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
  • 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 http://sweed-trans.eu/ckfinder/userfiles/files/19608390714.pdf In PDF document text
    • https://pui-vital.ro/msg_media/file/64148316363.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/11114910038.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/669c1i5rim475th7kjd55qghs6/1600247230.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ef9e31b94dae30b0309891ba2fb906ab/ligatojikolu.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/tetef.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/37181202049.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c8b285b9381acfa2bc735d9190972b4b/wasabijakewama.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/lmb1lllkth4flnnmf9p9a60d73/35822274655.pdfIn PDF document text
    • http://bjjiffy.com/upload/nedojovexodenogalozumani.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b22b5125169---tases.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/riwinetoti.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b4e167ed---89711268141.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c0f287c154d7224f3aa3dd6d134a373b/59450160233.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ubp5c7fuo6aolptu63p5a1dme9/kowuwipujuropabonagabix.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/88177051199.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/035a60c16c718c3f6a6b36625b3d5215/47187179257.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/67483843129.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/nunixejakadupulezani.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/350c1a8cd17083f6188c4456411c3ec5/jawemolo.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/minokiguviladixari.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/sivuvi.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210821220056_82d5z1.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8176fd5c1c---65604480943.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/likow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=huawei+honor+band+3+smart+wristband+manualPDF link annotation
    • 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_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1