Malicious PDF — malware analysis report

Static analysis result for SHA-256 f282b166954f0a34…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 01:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfea78bfad5b073c750705fd864e0bce SHA-1: 55d1dc4567ea55d16eeb0aa2e97a967459279632 SHA-256: f282b166954f0a3429c6ce285ec1f89c2d82a2df882eb8251bf36f8dd31ccc7c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URLs, many pointing to compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the presence of multiple links on disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites. The document's structure and content align with a phishing or content distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mylivediamondinventory.com/uploads/files/bavanulikuzaragor.pdf In PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/75273518932.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5a5076c440ef5f40d187a5bd8e310901/1619062678.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/balegite.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/kasutamalafiwatezewone.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/dotuxopofonexuxetelujagud.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/g9npg3n3mpj65gss9hdqvqcv9q/xopidemi.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/80134539294.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/45555523855.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/soresuxigalulibitaziduzu.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/fonanisajuvopajisidoj.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/kutogemivuvexowa.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210911145010.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/9469794061.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/89375387389.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/93888694566.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7299658cc1a9551a94c9b4fdf3af4677/79167127394.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/e9n5qlqutbsl9vibuk11tce64q/wijapupaw.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331bf6587dd---73374508832.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d4f43d62---30503953276.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/27301315374.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/45637932312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=transit+king+tycoon+reset+gamePDF 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_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 19308 bytes
SHA-256: 22b68f668e5dd4ad671d6d1dc2bdaa43df9bccbed1680b7bf9c74e5fcf797868
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 10696 bytes
SHA-256: 6525502a6a75877752953bedc03d66cefa34b76eae8f0a217f36d049dbf43e23