Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c5379902df1f73…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 00:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2aa89755a163d0782a774580b1cb90d0 SHA-1: 887c92807ec668d86f9c9f029d622ccf7e65927a SHA-256: 64c5379902df1f7358716fb30c8a18f7f75fa1077163d0193e28b19169f39a7e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the presence of a link farm and the compromised CMS upload link heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://irlanc.ru/uplcv?utm_term=razor+shark+slot
    • http://www.gamylai.vn/uploads/files/vejigezobuwekonuvupedite.pdf
    • https://vanchuyenduongsat.vn/upload/files/48588000573.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5b5d48ee814c2b1d680420cb50827a61/kifatilazuwid.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/87578121496.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/boretapabezinibosot.pdf
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/zowapogugopuwejase.pdf
    • http://pol2-simf.ru/userfiles/file/66862699106.pdf
    • http://polins.org/public/userfiles/file/12410589412.pdf
    • http://archi1919.com/smlclub-files/file/67062463933.pdf
    • http://jakpaisanestate.com/images/upload/files/wavodobuguvepatuba.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161402ba013611---45170419801.pdf
    • http://picart-personal.pl/fckupload/upload/file/xaxubunukas.pdf
    • http://cn-junsheng.com/upload/file///202194151016307.pdf
    • http://domadoma.cz/userfiles/file/kasunitegoj.pdf
    • https://rivieresoceanie.com/ckfinder/userfiles/files/279242768.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346abb13b7b---bakikizulelap.pdf
    • http://munnartourism.com/uploads/file/kuwiteruregaxikudu.pdf
    • http://xn--elementy-zczne-kwb98g.pl/media/file/9759975087.pdf
    • http://yaqeen-eg.com/userfiles/file/lowimewumazedibopuj.pdf
    • http://krukewittfarms.com/userfiles/file/parixolunotili.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614174201709b---50809907874.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d885.bin
0719c49200ae16a3d61a77faba57c41c89d2b14b026ca839e0085bc07fbf5fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 18400 bytes
font_01_sfnt_off00010815.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 16792 bytes
font_02_sfnt_off0001202c.bin
abc2c4925d99580363db4753a5c2c526b40cd9a8db4fda641e8407412931584f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 10076 bytes

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