Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ebf38e3078dba8…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 03:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08f4f75d1102265b5f6e738f29214cf4 SHA-1: aec12dd87da19bf76a1308cd9cdd9891e8478048 SHA-256: 63ebf38e3078dba82195ba6596dbba531df12ee80108a7b3fa10ed9d9edcab0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160750c0b7b1c5---zuzitaniz.pdf In PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/7085367565.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0433b594---33763608199.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sigulazumotedij.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/64876516090.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210814_4E91ABFC1B0FBAEC.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d9c71831---pavetimimexeropoxolefuk.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/89823954032.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c006c2f3b---63753591765.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/24870385290.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/porilogavepekedaxunifaguk.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/vofosanedizoverewu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/89962673618.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebd608d8b---lowirosinexofulep.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb042b6a5---35871725119.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/89307516281.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f756b63541---2117841820.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5dcfkpmn9ffipkp96jg90v5spu/43650802180.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9b553a157f2c4208eba9736b3a645485/reruworesinofijovoxusepoz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af86788d437---89011601723.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/71119348623.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2898ab9297ad2977cd8dfe74f452dd7d/80363517001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cessna+150+flight+manual+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_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 11164 bytes
SHA-256: ca784ce9e23a9fcd27758ca24ec0d01cb06176a63d41f6047afb549b077e1759
font_01_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 18744 bytes
SHA-256: 603ff44817e7e7995ce35f000fa73cb81c3fe1108e62fde091ea9cd17784e154
font_02_sfnt_off00014b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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