Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f9d74f8a466e7d…

MALICIOUS

PDF

95.0 KB Created: 2021-09-01 02:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1da199ead49dd8fe1e038e3dfd755ca4 SHA-1: 8d5d8a11ef028d6a242e7b7b715f0284963c526f SHA-256: 94f9d74f8a466e7d88a22147e1376f037eca00c25df359632a0f41ff8b934832
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves luring users to these compromised sites, which could host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=dr+holland+ophthalmologist PDF link annotation
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2u5s6fe779npttjqvvu58ohqq4/xidapozogepudedufozoweki.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859898b270e---59342250964.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/22980970449.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/360ff8d41e1bff8402152c5b209a1822/59725865237.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/jisufumuk.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167ef5ed44b---jilesif.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09b9e1a35---60720921588.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/deligexezesewularetu.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/dufikan.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/13635334835.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/16288878411.pdfIn PDF document text
    • http://enkepharma.com/upload/files/45135196221.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ac500e2ac---42115135429.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/36145031470.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7ac37ccb5---62312742530.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/10012276898.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/17742878770.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/18129797698.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/roriwigunukemubisijev.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0a3af8b3---munokokanozegevedimoz.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/83873512834.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/55164614443.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015378.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15378 17620 bytes
SHA-256: 72add116d0144fb47256984ad04869e2b71e55855b35abc7d3b736e62250e14d
font_00_sfnt_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 10708 bytes
SHA-256: cdff71b9dcf257ba52f84af1c5e1d42dd83ec087107096cfa6f54bc5d1b33af7
font_01_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 18304 bytes
SHA-256: bbba5d2d03d311a9ca163113c9fef050358c477c61919b75c112173a2463e580
font_02_sfnt_off00013b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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