Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bd6117b055831f…

MALICIOUS

PDF

82.2 KB Created: 2021-07-03 19:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6376db64437fb911590b71022f94a56a SHA-1: 2e6ae6a92800dc4cdfde356c6cb5487a9cee4853 SHA-256: d0bd6117b055831f27fc49438608b2e0d22c64d7a3bd5c7528369da699044df3
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, many of which host other PDF files. This suggests a scheme to distribute malicious content or phish users by leveraging compromised infrastructure. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/na0ajbb7apupl2lh0qs31198be/779995554.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/478b4cbf235230875616e8ff11e84d10/42131773703.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/07a314b56bb989e40d29b3d44fbcdcea/subumeze.pdf
    • http://hesexpo.com/img/editor/image/file/xidinotiba.pdf
    • http://fly.no1-yes.com/userfiles/file/meluwixadituwinejizomaku.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9812f623f73c177b0a2d9856a02a7c7c/tatugujixomogipusonosug.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160926b82c08dc---5036202370.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/179f0584c6e7679e76b2d6ba79b0306b/fijiwowuja.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/80a67b3817dd1511b340c6dcd2d16f21/niwuponalinovowewum.pdf
    • http://www.jindatunnel.com/up_files/file/65454316950.pdf
    • http://wolfroccatiassociati.it/userfiles/files/77713686625.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/e2rr468ktldm73brt8dntlljk4/nezosasozu.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1556863a---junewoxuxagevizo.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16071e7017bdbc---lonopoti.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2456f217a4---7038720103.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/25e549f5799d6f346a7518b6be2c4a83/83360099330.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e50b4a8b0---runovovubavo.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ddda79618---wozupepiwisigubesazu.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5bde1a3c9446879fba85a465e77498af/vamenako.pdf
    • http://frezerovka.by/images/fxeditor/file/89265745498.pdf
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/33464223026.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095e96de716d---16182934351.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gagubisobo.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6383a160---dekevi.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/39d4d558a521b53a01f55d9497be97cf/gabitujetabutofa.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8ac47c30---80343938705.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825cbbec9d2---lenenonujol.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842fcdc6e8d---33056950436.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fastest+to+run+a+mile
    • 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_off0000e0c3.bin
fb2c9e462b6b67e4f7bc1853942b23cf0fb2c655f03f18f10abd26016862ff0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 16644 bytes
font_01_sfnt_off00010c13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 16792 bytes
font_02_sfnt_off0001242a.bin
474096f0b19490046815a4ab9c9d186ff0cb02e6ce2477358135e158da56ea8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 10348 bytes

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