Malicious PDF — malware analysis report

Static analysis result for SHA-256 8118e794d28f7244…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 18:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc9572cb9efadc51d538bf0ad6fbd0d1 SHA-1: 3a44d8fd115bbd8d5d9f01a35cdb409ce391992f SHA-256: 8118e794d28f724470516af052f4de00a053f2e8590da116a4c4c45ca935cfa2
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious execution. The document also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or engage in phishing. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ampletrekking.com/userfiles/file/27233929950.pdf In PDF document text
    • https://oxi-dental.ro/imagini_ws/30263480591.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/xovesezorawena.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/fawajod.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4e855c42---zitidubov.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/38658864584.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/takulekujumifibixexeba.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/tejopufufu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b76555854151fe2c98c0639f21144e54/tajakep.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/tisupipagi.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/350318675.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_6BB566C6132BA1A8.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fafeb8c0---92672598117.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/18355134935.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/jisugerixile.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/wusijovukebutoro.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/38626302454.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/1119336304.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/rasuvuxisitemugevutadutix.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196912178004.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/83739055554.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/33286499763.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/xewuga.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/13228175748.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/pipazenefolam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+offline+rpg+android+games+freePDF link annotation
    • 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_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 16932 bytes
SHA-256: fb064c76c739e1017b9fa799ef09100888923007999edfe56fe1c994b5e7c658
font_01_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1