Malicious PDF — malware analysis report

Static analysis result for SHA-256 943665a276460092…

MALICIOUS

PDF

63.6 KB Created: 2021-09-03 08:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 596025d0dc72a3b154c264f2512f9ce8 SHA-1: e6284169d90469d89846b6c66b6ce92b7b1c5920 SHA-256: 943665a276460092e315b80fe9360ba5e7e687c251c1e2d3e6346e889b508792
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous links to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7920

Heuristics 5

  • 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.
  • 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://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a4f5e0de9b7b94c74a5422f507c6240b/28018633450.pdf In PDF document text
    • http://brukbet.com/user_images/file/92043027322.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/428b9e7035c9063a23a758ace254f794/12502982071.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/62558549421.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/runewokubowu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ovsi6k590ej4qtfql6ohfkhnup/6640543956.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/lanokaguleta.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/fodinemijodejogif.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/610bb5d260541d1ef96e8e9bac88c1df/79342796397.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/44639b5c6d44780992f14f96317408bf/43793962851.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/pujumixotog.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/bepukevevitid.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/fuvedopuz.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/331023d28de05397264e79b800f34d19/41844827563.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/giniponujipadujotodebi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e32f66aad0---bebozogiduminixaxul.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/26315591297.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e0167fc198047d7c0c06ecd5d359e83f/sononofetunuzipe.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pijesukixidopijo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ae75862b53832afdbb3848a43ae7495b/woxosevogosuzofomo.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/27614775099.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/bifinujaxibobodafiruvezas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=saitek+x52+pro+instruction+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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 18632 bytes
SHA-256: a9da285578e3e71c67bbfa89ff20e797302436f67ce6b33842f934f2cd6a2918

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