Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c6f8620afd414f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 12:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 997032e8ed43ebde39093f0ccf940b48 SHA-1: 117da6e96e81bab20cd90c3a6b4a816803b377d5 SHA-256: 25c6f8620afd414fce8addb616b9e147744397f9aac3e519a045b11c14e063f2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. ClamAV detected this file as 'Pdf.Phishing.Trojan', indicating a phishing or trojan distribution intent. The embedded URLs are designed to lure users into clicking them, potentially leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2529

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 http://dj-maily.com/uploads/pages/files/ronofurepuvonifumi.pdf In PDF document text
    • https://cytairtool.com/test/userfiles/file/20210915_45351.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613793f400799---samuzavumifesifuv.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/93146069639.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bodal.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/20333435255.pdfIn PDF document text
    • http://tradotel-riviera.com/file/10419706984.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5241d0c2672b3f3b01bf80c32ae4fbf7/wefozevix.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/xamuromawasodamo.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210902011306.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/widagamaminog.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/motoniduzoxedolemur.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/hl6fh5k3v84pgvenj1jvaent73/5917683517.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/47246599462.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/lojutiroxiwuba.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-5/20210905222059831775.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/17412380821.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/65729866514.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/57230564247.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/66608505428.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/xoxebadurubunemuse.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/94373554131.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/nigogisozawegojevore.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/65486212059.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/67740387770.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/zanigabuxosamulubegak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gapp+installer+apkPDF link annotation
    • 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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 10256 bytes
SHA-256: 082cb1bbd3165e6042d4d358d399ea7319a93c41141d08db98bb8abf4ab1f8bf
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 20220 bytes
SHA-256: 0652e71aafa0a0800c772f4d752d6ba6cfe7daa092f3bc872c233d9287955c9a
font_02_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1