Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cca04c36714cc0c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 04:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfd1e450363f70e1981083f1a2b1665d SHA-1: c783570d51e58e8ccf5b4e266e5740853a6ae270 SHA-256: 5cca04c36714cc0cd988396d793b745c92adb0c98b4302efa6f06bf033361969
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites that appear to be compromised or are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was unreadable, but the URL patterns and heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32bc2af21---gebozexosimofe.pdf In PDF document text
    • https://coil.hk/upload/files/55229162983.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e34139b5f---25568366479.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082db941de61---zinagolaxesubidajifefupum.pdfIn PDF document text
    • http://orthopediedelft.eu/files/wulunedolu.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/38915526068.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/527ae18077a250219a15169539868c0d/64075192485.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/mexasujonunaw.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c7d7p0jj30q0b8kgqqie495pd1/14956222291.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f933026d6ca---vevop.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/36330050831.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612466013b62d---40639197082.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/negobabesojotorupazaninon.pdfIn PDF document text
    • https://securitydm.net/slicice/file/mabukinusegubopilanoke.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/mevalixipo.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/32daa41314f30843d2ad10b3d9edb388/14171315390.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/pubeliwexumizibiwerisub.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1126e8d54cde3e8811d0dd174cf7be93/55009496614.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/23ba6c91691db3f0ea45261eeb6ae8b3/97853779209.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/wiborako.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88a37f4b6---83319763496.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jq7khm17fifcdl2ab3n2gnkb54/fejasoko.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/10624789179.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/65504883221.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b366df128---58666538956.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/2447096501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=subtraction+of+dissimilar+fractions+worksheets+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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 11380 bytes
SHA-256: bfc1434b94d0900682cbe11a1e9d8a5f6f40fa6fc8ab754b075f8093c47c04bb
font_02_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 18728 bytes
SHA-256: 6137368c0ff7c81d6d3647866e94e70ea6f07302ec57ab46bff7d09e823e700e

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