Malicious PDF — malware analysis report

Static analysis result for SHA-256 88355ae92fd18800…

MALICIOUS

PDF

92.2 KB Created: 2021-06-30 20:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fb9a7e9f53e26fbda9a810aad73a30fe SHA-1: 0982a87ce1e6e8d76a50862b0f2bdbcf32b43e44 SHA-256: 88355ae92fd18800e5e92fab701e05fb91f2c6c741bc8093d551290ff1b8aedf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=there%27s+nothing+holdin+me+back+mp3 PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf589140e07---fokibokafaditakovelov.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/133afaa5e4325bf4c858290f9b1b8a0d/zadababubebasek.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/c74403f0603ce175fa98cb4cdf0477e4.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/vtvv1o45r4i36e5tqf56ph8q75/mitefarelimepepakimatose.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a06446756ec---5049853659.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ecd5cb1b---lukimodo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba1a94257---dedidexemalobamamubimux.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/vajixaduk.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/cb2l89to3nehqootrbg7enm7nh/zidevujopozupapile.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6e794a49---10046567266.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050704075876.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708aef79eb8---sesejukopolovul.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/76706846501.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/jeio6p1vqh0ujck0vepbob4prc/donatosatimida.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/294ecbe0f7a5d4283647f084ec0fb1ed/kegotetosuteravogukuja.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/79650820410.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3pnd24ldb4gjoob4rkar7r0712/16768772924.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/sjmjhbr2v9cvf56im5c0didv5u/76464123081.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/tafasez.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bb4d6e43c16b34b6854ac92dabc26bce/52708220378.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160955b25f1eab---suwavatepijuwojaxagesomo.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/50038615569.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 4936 bytes
SHA-256: 9c3d3574f910745fa3304035d173bdc854d7629a10986f85b949dd88c8f78dd9
font_02_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 11364 bytes
SHA-256: e25ebc07d9736ac72828b240ebc3804d3f2467ee58e1a3fff88fdf0fdf4ac0ff
font_03_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4F 22120 bytes
SHA-256: 3bc859d1190e44decf28af2fef98a27c84ee40e84fb09ba702aad1b0c8469919

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