Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fc34dec519499c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 19:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 320a8f9087606fa4da59a008f08971a3 SHA-1: 180e28932fe866d223eb4794860be29f66d9dfd8 SHA-256: 17fc34dec519499c7be088dd02b52ddc7d5cd49af78ad2e70b52f0368aa1f083
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and extensive URL list are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=rewired+book+pdf PDF link annotation
    • http://nhs1980alumni.com/clients/878257/File/67831244598.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ad0b21a92293e704a9bd5bbe557f6183/68200114116.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/komemixopidetuzafumuj.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8928bb533b---veleruwup.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e6fcd90ab---28765537889.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/16502424479.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/xaronivibijivemuv.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/imsjjpg7730u4evtg4p7d6d0ur/nupejojulezevemesediguz.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/jawem.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c02660f6c---lazujusupi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7pkpa2q5p95819siof7925cdg0/wusevosisawisagolug.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/iqla6pln9vbeqcg2ashabofbl5/59556345244.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/tenogepete.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/pidimokinogekozef.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/sipije.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c657e1986---mogodegalanazaxiwazavuj.pdfIn PDF document text
    • http://chinahongji.com/d/files/79352905563.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/66688413697.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/61258591342.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf64cf2a8b---14246923936.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4aa2f3c3e99a9b0735c9c8abed2b8bc0/19471027135.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/15162655839.pdfIn PDF document text
    • http://clingac.com/d/files/70113635436.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/91174073942.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e99c0521a---10695800763.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_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10276 bytes
SHA-256: b2cb76dde723fb75a127438a1fcc28d37402ffc095f9103567d6dafcf008394a
font_01_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 17908 bytes
SHA-256: be6ca45af9db3de61c59466e4e56bf4f56e92852e1865773e16dd9729a0db736
font_02_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1