Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2544076edcce3c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-24 01:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2f27d01f21cd4e023474b6c1e19c57e SHA-1: 003191f293d310599985a2c0f8e9370407983512 SHA-256: ba2544076edcce3c6d1e42423d44904a8927e2175a649735bccc64736703b2c9
94 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

Heuristics 4

  • 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://chiengthai.com/file_media/file_image/file/52247598734.pdf In PDF document text
    • http://rapet.hu/files/wasezanagadafavi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bad710be13f---62232486176.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/pujugot.pdfIn PDF document text
    • https://migger.dk/userimages/file/nimezuwasapojorigukituto.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e77982a4ac0e349aeb0d80a6052f4cd9/30187055177.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7d9dfa53688ac22bb6110631b9460185/8091581750.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/96992682083.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160718d8e63a46---28615536020.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a73f7c45a---18341123423.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/99561916216.pdfIn PDF document text
    • http://519pf.com/userfiles/files/wutovi.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/90265362427.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4628bbc2---kulejumiruwiniganixoka.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bafa37660---mopibet.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2128774811---badagudosawor.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/29636286295.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc200a3ed---23601891584.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae7b7a49cb---90722233179.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/67047798951.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4eecbabcc---fuvilonugoguwe.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/43335513470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=affinity+designer+f%C3%BCr+androidPDF 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
stream_003_off0000f82a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF82A 18728 bytes
SHA-256: c1f19f1e9105d4448cc0837934251545b02997fcecee5421f850b8d36e172402
font_01_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 20396 bytes
SHA-256: 4bed9585dae6eee51afeb61fd433466c00784edcfbd03d1c5cff7683d91b5303

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