Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6e8d0544d9d9e2…

MALICIOUS

PDF

75.6 KB Created: 2021-06-26 14:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d5023c8d2b9c60313bcf212160827b66 SHA-1: cf4ab8ebf196890841efe8d85a767fb36f969bd1 SHA-256: cd6e8d0544d9d9e2135c84728ae9485a898b38e955b715f04400d2f1d71df56f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest it's intended as a lure, likely delivered via spearphishing, to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=reaming+operation+pdf PDF link annotation
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9ac17b3b802e6e10a4e28f4fb703b41c/11475502601.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/fibagetejupuxelas.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/411490477.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859898b270e---59342250964.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b6d52cc607b08704df0d8dec4947acc1/6774143204.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/1499ae4a6c863790795f52ea9319b7f0/26598980507.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6c7714cb14bb8225bbb782a38cc3e20c/reniroluwekun.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/75536336394.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/xetexipudidojepebaluke.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384eda6f94---pigosasiki.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/vakoxutobuneralaxofuxuza.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/mejewetalu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6963021be---45301498643.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16095b142c0cf2---10766677945.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4abfcf600112394c84474f15d70a3664/lafimapedurim.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d9059472---xatuveruvevijibobuzorusa.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ra86v7f5l5lnbtpitilqvi11a7/1362211953.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429030026570142.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c784f893cb9---jakimitej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e529c457a7---nekesobelanawejajojado.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021062618495630.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f08cd0261---69031307011.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/a3fa6ud4mkurv55e44ac89c1ih/tatulepo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9hmggd0hsvfihi665i4renvcnp/lojokegadu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095d190c6b22---4533967068.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_off0000c844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 15824 bytes
SHA-256: 8961be3ea114aba3d164db9842b069837f7254b8012496c8c80d406db102c3d6
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 10672 bytes
SHA-256: b7cc63f0f1cdd16bfd18361d459925836cdb9c0a1d36d6ac49a5b41fd3c953f4
font_02_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1