Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d3add852932892…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 06:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 14eb239ef92550a0bdb346025fc8e21e SHA-1: cd4def4ff29bbc481366b49faa91bed09dbd0104 SHA-256: 51d3add852932892544cb4cc013d9e0973c8712338d0f67dc12e08e69ff379b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=demon+slayer+episode+18 PDF link annotation
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35e9ab2e3---pejojefujowemojagifaja.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0c97b6ff---mapofo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/9723275093.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///zawutetogazeferusoto.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e7373f11---tuguxesejubuvuxugemiwuzu.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/veximojim.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/47088229675.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/jenanupogavukigekobofodox.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210909164952549.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pamv82m051uohk8gq5hf52f1t4/mosusagemaxirinekixezifof.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/50315756992.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614149880efd7---fuxubasewixanikeb.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/lazunuv.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614161fb26b87---lumarotojipetafevanada.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/83945296976.pdfIn PDF document text
    • https://senegal4d.com/contents/files/lavufonodomojilemu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a4eba5ec---sefizuzaruj.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/rinediluzufoferuvajarob.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/gigasokunisiruvewiwukik.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/lonanesixokukagegifenom.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/095c5efe8a6f895275fcd8215d21c3ed/ralagidabutel.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/3814947603.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_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 10828 bytes
SHA-256: 5fd5f938f0bdeb1f9b1f794d4dd7d65b2f986ac81cab2cc7bb8da6c3d4703649
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 21060 bytes
SHA-256: c5278bf91c15ab86d4ff2943a9cb7eb17e50bcd0f341fb8d145745ba843a967a
font_02_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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