Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25286363c1c4d5f…

MALICIOUS

PDF

86.6 KB Created: 2021-07-08 06:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d88cc808414c3a0fb2c2f41ceab1a6bc SHA-1: eae0c5607878adaf887553e3c3971a25499d51ae SHA-256: c25286363c1c4d5fc659b1b93a669bceda4753cb3c652da93c0099d0e1dc0895
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links indicates an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=chums+ant+and+dec PDF link annotation
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/de7653acf5cb15a7280a7d4f27dd9a14/pazuper.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/24430087943.pdfIn PDF document text
    • http://coumert.com/images/file/paxurimixepazude.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512220815526.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///gabuzuwinujaderijupov.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bddb197653a77affeb2978011faa397d/59951286493.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/pifat.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e751e80dc6---47928764050.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd878b5a459---53217503641.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa8cbd704d---8601703809.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/afecc96471a438a3c18060bb13ba8cf7/nofugifore.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/21l0iuu0d0dc31b1srceesiv55/folevumoxoxir.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e697a838---kosudikokiwizojepozurof.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1d1f3bbf09cd142f215d5bb0cfbc4784/wufilaraneji.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f0247fe4---dexikevinesosagupetifozer.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078478d24a85---jinatepasulodakegarefovud.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/gelujuz.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738263126cf---91434380878.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/45947422062.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021052513342_553867366.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/pozusifikax.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/1034138742.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/39278007479.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0b9291c2---80925552573.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_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 10408 bytes
SHA-256: b1ed9a0683c665fdf5d4a470acb56aba8832c1e676107a85a1f77f190b7d6acc
font_01_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 17988 bytes
SHA-256: 1e7343ac92267d9b958fa09576923e03bce8f30f3bd1938f181af28c76bb3578
font_02_sfnt_off0001352b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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