Malicious PDF — malware analysis report

Static analysis result for SHA-256 b892802ef8f3e242…

MALICIOUS

PDF

118.3 KB Created: 2021-09-03 19:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a40959f541ebd8e4f14f448ea11c53c SHA-1: ee62a11dcdd0a0b13440877f118dd9228860f214 SHA-256: b892802ef8f3e2429d1db6549df9bbf6dfeb99ec04ef4eea8081b7f5dbddb4ab
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it is designed to exploit vulnerabilities or trick users into downloading malicious content. The 'Fake invoice / payment lure' heuristic further supports the phishing pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://philabc.ru/uplcv?utm_term=exclusive+sales+agency+agreement+pdf PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc79623ea4a---juzanepejilig.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/pevanuxumulomosukefe.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/70892225059.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429051934319219.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/besuveduretubopifazu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16111ba5765832---mufepinipo.pdfIn PDF document text
    • http://islandpointfl.com/userimages/57169669170.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/53957628342.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/jakorafasuxov.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fb352a0cd36cee8916fb64ceb561fb56/6844495533.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ab1c69c8---6431255416.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/56fe32aba15018d044a55708588acf32/68924280745.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/befutotilomasurepe.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96008d0f80---35073617227.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ae383cf495ef9d0ad2201caab8e36344/38748796794.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071a73f627---gojefuwapumoxasuk.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afa377b3755---28503270309.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b54a7d25ce3461846f75438647e15657/jovorefi.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/45067923925.pdfIn PDF document text
    • http://safetypath.net/cms_images/52131201898.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/96325360749.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/682751f975fb437840af7d0a1b3187b4/busufekuzuviges.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/negakamelikopepu.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/memofagifig.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855c4531bed---fodubuzak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16706 19628 bytes
SHA-256: 194e7cdf51b1f11265f9e1c3139c2a4ccc5d87f4f6a3eab73f4de1ea91806fc4
font_01_sfnt_off0001990b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1990B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B122 11208 bytes
SHA-256: feec1cf2630bfa7ab16ced08156d5202be80fd275dc2c8631977227acca50635

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