Malicious PDF — malware analysis report

Static analysis result for SHA-256 b362779fd133e54a…

MALICIOUS

PDF

78.9 KB Created: 2021-06-29 19:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ce3c798a50c4169e6fd3fb2682bea509 SHA-1: f7cd68b189ac3b23afe86b9e44b6714f856a04c8 SHA-256: b362779fd133e54a2f8c8520ec9f148fca244f465d416b1d1230aa62d32d609b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a12d1842294---80812458179.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/85891674558.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa1ad6654---24619876911.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ts6cgstqoacgo2195h4ojpu512/figelumadoz.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/titatapuraliwikunozafafep.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b193f3a3ad---6379761030.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f1479d319b9b23e70ba0536022724de/85113907150.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea32a7503---29645575714.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/32559144391.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/esu44cdibs9lpfp6ce6fjvtfl2/85962524569.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bf8079134da83bb7f2194ad503fc3140/90345234912.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/jaxakiseminukalajajixapak.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160858b0551bbd---wesisuvuwegaze.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a35f11d5---40707578733.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad56ed186---75007487272.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7bf4f88311e85c5f38105999ce28cee8/zamedelude.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/uklsl0e59muguntiko64eg3lsj/luderiridivinitifi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc2c5b9e9---21953078862.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607729cbdddd8---fajijisigezimapebeleme.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4566da30d2---84826289817.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64ea0ef4b---pididodeduwedipikodokive.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kevavajisevobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=business+adventures+by+john+brooks+free+download+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_off0000ce99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 17112 bytes
SHA-256: e37bf7704b5183151a6e6e833b830437e68c104edbaa7cff421ad5e991a6407c
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 11376 bytes
SHA-256: e22e23a43ef029e421a7db1b7d13593a9f5b98df338e66c9ba6f36c470c1912a
font_02_sfnt_off00011618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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