Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b5bf6d30850e5f…

MALICIOUS

PDF

76.7 KB Created: 2021-08-18 21:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc0ffc5454e8a8571ffa527d69bac2b7 SHA-1: b422cdc324c820d76c5964c27b48a985ed442c1b SHA-256: e7b5bf6d30850e5f711d71ff6b55831e1e1dc16e4ca9bf186d4905c8438148bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5adf30ecf65a47cda26e2a639dcf675b/jaraxukuv.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c379232537e3b870103ee3c189b52d1d/61559462571.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57105586167.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/vuneluwutonuxenetisu.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/kitepifimisuviz.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6568d16397adf5b63cf6c1991665e2ee/robojivanunid.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fcb1be845---40507371640.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/lidodazolu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081946635365---kukazamepafokidigip.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/n8hlr7q1jtjc8ge1v939jkbpp1/mabipadalunirilofaxigugos.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b42079ffe8---42103425718.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3b3393c3---3470639893.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/najukuvogimam.pdfIn PDF document text
    • http://mebco.ru/images/file/tagofonupawusikuvuduri.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/kutunil.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/e510heb0tat1m44qfk9v123f3r/53246633114.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/nosukebofodufakawutojer.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e91a5a6b42---62069047736.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/086a6745fd579006b3ca1940e96587cd/fedifapukesa.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/30763852154.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160721abe9221d---27322656240.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/dotibezotuvade.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/q04h9c50b88gvp30qjc7c0bms5/jijajibiwirepupumibexoxa.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/59286930397.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac066ea7c0---genunenivupupujagumesotot.pdfIn PDF document text
    • http://belovosushi.ru/files/64063219875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nbr+14323+pdf+downloadPDF 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_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 17340 bytes
SHA-256: 17dda58f3aaa370dc9d6a84bc507ae0e98dc82270a7cbf8fc39492cedd7873fd
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 10624 bytes
SHA-256: 669bda0d90eb40aa4143d084923eb08581f38ebc06ce04eed3dcfc69bd54227c
font_02_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1