Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea283f31b774371…

MALICIOUS

PDF

127.6 KB Created: 2021-09-02 16:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 071e614d63db8daf224ef16128cdbfb6 SHA-1: aa97507cb54f93f325a63a9fbfc03d2f95dc79a1 SHA-256: 7ea283f31b774371b6490fb95e53c41aa92f0719600eb938ef7e2e9c58dcf754
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to download and execute additional malicious payloads. The document also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=cosmopolite+a1+pdf+download PDF link annotation
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c990e1703---37975552721.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8d0c311decc2467b84cfada1b7986d48/xizizasedidazisolelabefok.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/xalisenanaxuluvadi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6a8a22a7561906599cc995ce24dad9b5/dujuwekijinijafe.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160734ebe3d5a5---xugivefezetaxisewexevip.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/16om3lvlllekcsvpbgrisi29c1/22646746144.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j0ss4su3k4s7ipl2i1t4v6rv76/vuzukoliz.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/40494855446.pdfIn PDF document text
    • http://allycatering.com/userfiles/bozixaburofewama.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/jovupiwagafikejiku.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/zemudisagade.pdfIn PDF document text
    • http://24cvety.ru/upload/files/bokejapoxuvakevololop.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff42f2f13---89988407670.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/99128149506.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe275489b---mikuxijazosabiliz.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/97119418690.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d356df2220---400241588.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/72146754391.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/pebatenojutexupinitaza.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/85399953676.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/kugekobuwawos.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/2959f773159a480cda12342691c3f0dc/zimukibulozofanojafawej.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/13661965208.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/79813926855.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
font_00_sfnt_off00016d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0A 10728 bytes
SHA-256: 2fae29a42f6892a5e2583ac8d8badbf134aca9084a9d2890be7dd3d82cb0f450
font_01_sfnt_off000185cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185CB 20984 bytes
SHA-256: 596a70b9cc6cc2ceb2d901c4d95a5ad193f7122b568d6e87ba2977bcb15346b5
font_02_sfnt_off0001bbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBAA 18416 bytes
SHA-256: 96bc6a2fa4a23e54f6270b0a1e8c20950ccf414dd8ccdc5de16aaade4bd059b2
font_03_sfnt_off0001d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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