Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb15f21567c7ed60…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 22:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 755a1476933a2b68bb85858371ab581d SHA-1: 219facc62745b5e7641a95e87e70f445b1ca345e SHA-256: fb15f21567c7ed60f18d24db86d226a0596de69f04bc7cea7cd152cf76030a66
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://russiancosta.ru/ckfinder/userfiles/files/tojijebadi.pdf In PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/33218863086.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/54852827497.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a4112467a3085e93dd346b64e45f0f23/nitamomijazaboj.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/20910774963.pdfIn PDF document text
    • https://12shio1.com/contents/files/97510058409.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131c596e10d7---76277975970.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/muvasopomowip.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/89915126342.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/mazeduxazefirisemibegef.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/nutorizoleselijakoj.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kudelaxemuzojuxobejifev.pdfIn PDF document text
    • http://vladekoservis.ru/files/66969586066.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/fokizisenux.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614339c16e4b3---nebolokomakeranidu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e04a9868e29bacf35e569f2d8f8fe174/wipuxa.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/aed8c66e45edb8a1e057b013f9b97efc/53176093012.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/muwogijunazugizonesij.pdfIn PDF document text
    • http://ijfbn.com/editor_up/korika.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/sawidazarakenewejazujiju.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/9571685453.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/jimutosevudujeg.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/wutitasaxifopabulitoruwef.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/fonufuno.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/52679284730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=william+navidi+statistics+for+engineers+and+scientists+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/pixavuto.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 17208 bytes
SHA-256: 19ea6e62939724d77d3bb2a8cc6ebce40f480bb5a98c385300ccd855cb340221
font_02_sfnt_off00011935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 11020 bytes
SHA-256: e0a11b686fa01fb77027f714093ee1d1c54466123568a91ff442d4ee0d61ad70

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