Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d37290677dd0af4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 12:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c388587e4cd64a00db8ec6e6ffcae88 SHA-1: 06ebd687195e3b93fac1d1eb395116226099f720 SHA-256: 4d37290677dd0af443436cf8d22d35208dc125b2b1510598698615d72ba2c6db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the PDF is a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=macrodroid+vs+tasker PDF link annotation
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fc3eba6e---71358793725.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/bopepu.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/53886610942.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161370b07290b3---53537742237.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_3D5BECC297B27759.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631031309.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/jibosusizidupowu.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/vasekoridof.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/2664987470.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/torigoxekaxuwaz.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/zotitunazemolefavumobe.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8d9a3f4c---60502833102.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/tibexuposoruxobobu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613024711b4e3---10476965172.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/mimelomaj.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/xikuwuzadijojudawe.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/vupoma.pdfIn PDF document text
    • http://maidichike.com/upload/files/14949109434.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911150556630723.pdfIn PDF document text
    • http://dhf-china.com/d/files/75355221917.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3cf6bcbe4---66835656487.pdfIn PDF document text
    • http://firegallery.ru/img/upload/12095837971.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g4jclgr8nnb0bam1dlsatmk6i6/31757732898.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/siliwam.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/rumagezifuvafuvazafedig.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/zaguvikaxorixori.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/23462062024.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_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 10364 bytes
SHA-256: 24e22eca1964628b2b8c9a7f5ab996b78d69da17ff7ddc3873a41e65d8cc9d4f
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 17476 bytes
SHA-256: 60d83f1a4bdb277e3644f3fbe9751741abc8abbe2c9413b9ce3bf03712074837
font_02_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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