Malicious PDF — malware analysis report

Static analysis result for SHA-256 c419bf206e2de43d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 06:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbe536d497fc7e60a35141cb9883f631 SHA-1: 595001e9e8217bbefc4816b8270a9688d0e86980 SHA-256: c419bf206e2de43db33abe0c275a7fe2d3d2a662da5e6b37ccb146b952065161
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The heuristics indicate the presence of external URIs and link farms, suggesting the PDF is designed to lure users to compromised or disposable hosting sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6788

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 https://allytemp.ru/uplcv?utm_term=full+hd+movies+2020+apk PDF link annotation
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/midabelaz.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109161006492274.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/76760948573.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/63463099069.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430466a93d0---94701906074.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/dasaseg.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/67168804978.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb8513f7---6187430577.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/pakobofazixumokexojur.pdfIn PDF document text
    • https://tarsiman.ee/files/file/97766438010.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///rijuf.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/kewitivevutesog.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaaf1e7ab---tazugosajalejo.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/sitot.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jj7dfl5bo2onj8lbm21jk741hu/bubes.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/biwawibawufejaredu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wizofopabefazegijones.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/koriku.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/29384274139.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a476898e33---50697753892.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210920223816.pdfIn PDF document text
    • http://eichler-kammerer.de/53063869751.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7ed651fe7861b44c0a54ce450af45961/xudedelifexugedit.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/53403870056.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 20468 bytes
SHA-256: 2ea8d0568c039e0bd71cc35b0a67fbf32b4de4c8ea47732d13bcbff49f23be24