Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f1ead3ba410b19…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 13:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43f8eaa2e45aa0629b1204148ac04134 SHA-1: 35434af62cbada41255286447541cfff70eba2ae SHA-256: e9f1ead3ba410b19b7e0c2c1e5fbd119447b4e6a69c42058503500c9e01a3fff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs and the heuristic findings point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=phases+of+business+cycle+pdf PDF link annotation
    • https://lawrenceyezersky.com/userfiles/file/wovuxitisonekafaf.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/68420201346.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3c7a71fd16---8586781359.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/35492122728.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f0239683c77---faxuvuzuv.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/74b84e16a752bb5d8107b69635d08e88/pajipipomesur.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/tugovufimexazurobef.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/75f254b5f448b55f55b5ed8768b3915b/26933167007.pdfIn PDF document text
    • http://blueyee.com/upload/file/100043081448.pdfIn PDF document text
    • https://nistd.in/userfiles/file/jamazijum.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/24136066910.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/91760834.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34760820173.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5a99017b7c2cd869b115dc3654d0dfae/57532642281.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8279312b---togoritese.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/bopizonewigar.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/raxejewigonukokipoj.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/ziwuzifabatigoxogavi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/p5jsglivfm5ilipsue9loterm4/jegejalolajatajiwepokuxo.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6d6e02c1---60411183975.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e5e48d58---19281282172.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/bujasalimural.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607057fa68dff---50718626889.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb1e4b85bc---76323581512.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 17312 bytes
SHA-256: da255983e8aa355f55fed01321229032f0aa98b983b905df0db5f6bd15454ef2
font_02_sfnt_off00012994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12994 10876 bytes
SHA-256: 683b18b2132bb049eb5191143887fbb1a718f6a8cb1dc4405bed38c953087732

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