Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb87d25003a7183…

MALICIOUS

PDF

62.3 KB Created: 2021-09-24 17:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e1b15792221dcacfd6994a440e80d77 SHA-1: 23aca6aba097f566f962169bb56e051ff71bae87 SHA-256: bcb87d25003a718393fa8c7c01e5477b3b12ed620fb8850c2b937ad7fbab2756
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, but the presence of external URIs and a link farm pattern indicates a likely attempt to lure users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7344

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 https://pixomot.ru/uplcv?utm_term=download+dream+soccer+2019 PDF link annotation
    • http://kaies.net/upfiles/file/volewo.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/fekapaju.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/robufa.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423aa80e2a9---jizapatewagusufup.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/30555544110.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ea0ec22c---konokavevasejajekejoxatut.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/lamokepurawenomaj.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/worigodevupezunadarigex.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/65116608139.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kugawagofomomokurasiw.pdfIn PDF document text
    • https://shinaltd.ru/images/file/derilawarapolavafored.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090207003073499.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/34050999084.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/64039020317.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/penixipokolijibenigi.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/91695409821.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/25895633228.pdfIn PDF document text
    • https://shibbirs.com/media/files/60833814862.pdfIn PDF document text
    • http://koala-al.com/d/files/jixozugadudin.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/todoj.pdfIn PDF document text
    • http://ijfbn.com/editor_up/42925779945.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/duzosiziwutuxonogakuwur.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45488141769.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040f78453a---kedunexusixivusa.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vaturiwudigaw.pdfIn PDF document text
    • 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_off0000b6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A5 10892 bytes
SHA-256: 62e0d8a97eff9101bf2989cf4a8373cc40b400ded6d81cfe09668463dcbf721f
font_01_sfnt_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 18232 bytes
SHA-256: 785cfb55c75995fa2ef32f4f3982176e0d4e47e3a7d8fdb0dbf2153efec42b5a

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