Malicious PDF — malware analysis report

Static analysis result for SHA-256 376ff3fbac8789b3…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 23:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6656ab03cb6b4eda74c4c415393d215 SHA-1: 6c9f792f6de6f51fd8690684d718851db6061609 SHA-256: 376ff3fbac8789b3dddf28852f1bc5edbb0bad707b969c7b39f4ecb7e6552429
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as a phishing trojan by ClamAV. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous links on disposable or compromised hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6kq0d7gjq80bs49m62tpkfs4s2/8824475674.pdf In PDF document text
    • http://21cedu.com/pds/userfiles/files/87166790004.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad146a0ec8---bopixewokozokudanebaro.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tukajisivuvusiligojutabo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608246b2724c6---zekitekapebe.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/soxiputuzowib.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c35316e2f5---35865003805.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b351de452950a4f2420c55e46d6d1391/81814743083.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/giwagalileradilozaduma.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b4ab75fbdc3f46b9cbb60470a5720d88/32369949646.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/46306815383.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/61679585348.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab743a93c---80579290928.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d716cddd---71470492686.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/rufojule.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608897d2eadc3---fosutazuxesirodagogu.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/xupudolovijumuxuzera.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aac426c41---tunikigobenel.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5140e2e58a---96408214121.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96cff28f6---36596193712.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4166ab173ac298916a38900f26a251e7/51798565669.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2kmr40btenkgi82b15ep0rnr92/35056443975.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73404e2174---97785707258.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/61313091196.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/d23j96gha569iacn7albtt8265/52430225625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=classes+of+arthropods+and+characteristicsPDF 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_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 15980 bytes
SHA-256: 295a16a086ff1d3d575107bdca659577d3387cf963234631ce211475e02be07c
font_01_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1