Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7241a534cddee3…

MALICIOUS

PDF

89.6 KB Created: 2021-08-24 23:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 937983eccc0cc2be5d09579ffb5f3278 SHA-1: 4669dc6aff45d13200509b9588f148bc85ad4aea SHA-256: bb7241a534cddee374cdbc2dd32a3da250396739f49f4ab7f4f626171bb60183
132 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of further malware. The numerous links to potentially compromised WordPress upload directories suggest a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4274

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://thietbimaugiao.vn/Images_upload/files/2758433837.pdf In PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/zarumesumutubukubuwinezed.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/54347515778.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ceae3dadc---vexijoxerapokage.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35cebca57---zazubuzefopanamovu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160872601d126b---31297275875.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/getasijiwilebuzasexivon.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45422615395.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/kelizasimi.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/tiliminabomanakefadolenap.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gijosinaralobosuju.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/98205130509.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/8fc3bf8e505de19ca259ea06edf0e7d8/21855110110.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/robexotunixosoxeput.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076f00b617f0---51579689883.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3a5e3046---bewufatesufuzewalodox.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/baa0ed0399bd334fe0ed6c88b640e97e/35608580401.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/rulimijixa.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607032260a2fd---bebuzirazunu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/95197760611.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c662d35160---14280443775.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e4f66d2e---pimutovinimakuri.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/62505521848.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/daxofux.pdfIn PDF document text
    • http://kokalietudarbnica.lv/files/files/31605404285.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/penajiwofevijuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+product+backlog+isPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014e29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14E29 17949 bytes
SHA-256: af8f7260334d3d55443d34251a0292128395d06df7835e4759cc5f8cc14dfdd0
font_00_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 16348 bytes
SHA-256: 85fada6a5f09144e84a912ada11a9c3af8364e3c8fb3babc56d96ca2b3116b31
font_01_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 10984 bytes
SHA-256: 156ed9a806a9b13b9182542dba4770685bffcadc86a8bec28810d3686db231cc

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