Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ee3d04249b2e65…

MALICIOUS

PDF

89.0 KB Created: 2021-09-12 17:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba66b7a6b306666bcf454b167d77feb5 SHA-1: 7d6ff13da450123d106f137d1305f3d25a0311b3 SHA-256: 37ee3d04249b2e6567bb3e42c1c027540a00855dccb6ff0ead5b38981252eea5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to drive traffic to potentially malicious sites, likely as part of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ulsantour.com/FileData/ckfinder/files/20210903_D9D765228E06E35A.pdf In PDF document text
    • https://geya99.com/ckfinder/userfiles/files/sagidabuzu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc555bbad---xeguladixosesolikapasis.pdfIn PDF document text
    • http://patroha.hu/file/letiwe.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/76272328484.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/54729023085.pdfIn PDF document text
    • https://eguiders.com/uploads/lirolepevedibafidapofajo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d37d8dd41---74736852538.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/pupug.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/bawore.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bajuvaduru.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109081204212161.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c389d7de011b8d2b58342f11df2b0664/xefabuvivejomakofovujefob.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/47733109842.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/78517048373.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/9614278548.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/5630356984.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139175cad3e9---13762476010.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2445d85d0646fb5e1e7749ff2e347407/94072658558.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/lomijevivutujatisenagom.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337808ed637---24894862070.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/21970007152.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/juwilisiwejopopuponumexok.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/rafuj.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/93158952943.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/jorifilosukipafukiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+send+apps+to+iphone+from+androidPDF 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_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 10792 bytes
SHA-256: 01194317dc73113a5223bf20eca6b760a8485535518869d601b55c134d837727
font_01_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DA 19140 bytes
SHA-256: 0be79a1b541f1c3ca4efef1bf0ee7d575c0f28425a8b6e51ad87706b6877497b

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