Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88a4bb2a6228491…

MALICIOUS

PDF

77.2 KB Created: 2021-07-04 02:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c8124699a0c7399c1ca85552e9ea522f SHA-1: 3dc8dac6f2e95f118a956fb3d013e21273c29d4c SHA-256: b88a4bb2a622849160a29cf5071b89ab3fbc9867a9b36d56e7f78afa1978ea0e
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised Content Management System (CMS) upload directories. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is designed as a link farm to distribute traffic to potentially malicious sites. The document body is unreadable, but the URL structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://mattress-leader.com/media/43440050396.pdf In PDF document text
    • http://esistore.de/userfiles/file/lurofevodejaladofoninibap.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/1jm1v6kamffkf8mgbinff18d83/28315625573.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/89154195121.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae28224506e---bipulifobumuvewi.pdfIn PDF document text
    • http://dnepropress.net/files/file/ruxebilexuwu.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/64476616127.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b648aecfa---rarutarifevijivopemaxote.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1afdf9bc568e1cdd01587e78df12f9e4/mutewekiwuvazep.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6de59fbcd---zururutuz.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/49197628000.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8b40019ef0a707959bf6add06bfdec58/dofidijutefozediseb.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/56088923796.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/sqr3fp9u3jvhfghfu99v7png0o/wesate.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/41244251531.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/14589090717.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bef83f4e0---genutudodigugedadoja.pdfIn PDF document text
    • https://ksuskalology.com/images/file/96940132836.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a8034fc1a---gixududerisa.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/454609776.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/mifaronudokivuwemugojot.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082331612e3e---45582957875.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/tuguzimeditetivusovubuv.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca8c251b2---bosajixin.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be80b255d0f---wexiwudisedoxulivumekix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fundamentals+of+production+planning+and+control+pdfPDF link annotation
    • 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_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 11040 bytes
SHA-256: 2d4f94a8f26df2634e7a576b3d056e8c88f514c06d19ba350973b76799895d75
font_01_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 17664 bytes
SHA-256: 021c7352cd4b4ec18187fcacceefd14c99ba2eec2788755a5f147fd8ede2d024
font_02_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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