Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e27d22cfc81050…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 00:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab9d99a698fa0e0fbb41f1b45939c226 SHA-1: 0174f0e507c7333c151d63828a9c7b81892062b5 SHA-256: 08e27d22cfc81050022764ce530f2d92818c506583ad8764f39d1cb52a237186
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/61909924338.pdf In PDF document text
    • https://rhuyscampingcar.fr/images/files/vulowapadizosuj.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613662534a8fc---figotu.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/lumofojowud.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99b5097ce---nukuzeluwotafaxamofub.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/xulukizarajuwozova.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/52331351311.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/10090670747.pdfIn PDF document text
    • http://leguido.net/files/pitidejeka.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/duwunigodot.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/89qm7cmf8n6oq9kgoj5d6ln0ru/tiduxoxajedid.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/38949834085.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/gakajezuvepezolete.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/rimebitetugexev.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r6rj4f7p8t28d0heab0mrhvl2d/78766985514.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/sozekem.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/letitis.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/52305714610.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/59600061041.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/23309174040.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/gitisijajid.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130278740fa7---42363396614.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109070520534662.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/18402589961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+rom+zelda+breath+of+the+wildPDF link annotation
    • 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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 10740 bytes
SHA-256: f133eb46ccd8eb7d8f5ae9e264533374f3778d200ff7ad28569453d46fc7d2bf
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118D 18980 bytes
SHA-256: 3d30ecf8e66a46bf129f59abc9ba59ed33ea7b677738c120e06afab1f1c6b8e2