Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c7a4eecfa0ea0e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 10:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9533ca8c3b11925645b6a60a688ea8c6 SHA-1: 4803ea55d1115dc77b010b70a215fd2cadbb3535 SHA-256: 01c7a4eecfa0ea0e18f5ae1c5978c5192ba12f39febbf58e7a3d3c7d6c77b974
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users. While no scripts were extracted, the nature of the URLs and the PDF structure points towards a malicious intent, likely for SEO poisoning or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=strat%C3%A9gie+de+gestion+des+ressources+humaines+pdf PDF link annotation
    • https://polnische-zaune.de/userfiles/file/37020877410.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/bimivugakur.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1011b871---71061697502.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/22266040034.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdc516c2d5---gepesomejuwasagemes.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd91dc2036---siwirogibimupoladifekav.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e7f4b31308be2e210205542c8ba769e4/90186505664.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/tadekavamu.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/67111698479.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/52731139284.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/weguwexuviwesavuzogozejaj.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/ruluzebiwukitibozusokom.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/foparinufufumasoxupin.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hfg41d1tvohvondaujail3deto/xugalu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/bimadi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/deminajamod.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/7359687443.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/jifegixuretaramivapi.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/jazujivajifozoxatafomojuw.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/vr9q98ueeotvnn3ij74al1aat2/kajagivobidosederuw.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/44557805179.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/79aca51bf4425a3151ee5b21a2f7aac3/fobosuduwemilijojulo.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_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 11352 bytes
SHA-256: 17c98b0f1ebbbb93e671bf9eeb6360be4647d52a723cd42866ff67cd9608319e
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 19488 bytes
SHA-256: 1238fa356cb24d13f28ed6f5c227c20efc64e33aa82f724ed62daa41c5cfc866

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