Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9e7b46681b0d51…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 10:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec7319b11bf823e7cfef47eecbb895d5 SHA-1: b47a8bb5f5f987971566cbf7bd0dba7270f33a48 SHA-256: 7f9e7b46681b0d51c7515439c96e822f4868d2d0ef38fd90044f0d738f735ee2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several heuristics indicate that these links point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=vocable+all+english+pdf PDF link annotation
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a9e23389becbc818a0c2da8f1daf77ef/43526120155.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/32051621391.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/jipodigo.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/mujoko.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/tubipufiv.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/79824632776.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/83614426486.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/mewijegetawegopija.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/gosevusu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6dabaeb87---12360115624.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/xomerizuf.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/luwugafizuputakupida.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/45812142429.pdfIn PDF document text
    • http://oris-am.com/editor_up/35308677871.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/labobovuzepanivuw.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f472062b8dd---bofobemogijojo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160813575207e0---83347330712.pdfIn PDF document text
    • http://aplus.to/userfiles/file/riranugevavifapenunuzev.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/58153497576.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/57767391223.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/99025341261.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4eekruan99c6sgil65ju8cba2i/60235787415.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/wofimeladopenad.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609482593a419---63882849222.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_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 20844 bytes
SHA-256: c54961ed38f276ab976132ba56ea4beae329193080ede0bbc2d7bfabe57c33da
font_01_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 10808 bytes
SHA-256: ec29004d004c0ae07e2eac3eb62f41a40b7815143f9a9f6bf2da98c522c0f343
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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