Malicious PDF — malware analysis report

Static analysis result for SHA-256 204323eca6b5fcda…

MALICIOUS

PDF

81.8 KB Created: 2021-08-23 09:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ee06358b1df888dca3a2304ab751458 SHA-1: 198fbc8cb008027d46c477a377f8a4033f1d5f6c SHA-256: 204323eca6b5fcda06370ea444ae1c235347dec689bd49a4e5b689b58a0c7687
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute a password-protected archive. The embedded JavaScript stream and ML classifier strongly indicate malicious intent, likely to deliver a second-stage payload. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf847345e6---zesomuduniwi.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a976ce1b---tabudivudivurixasugavupor.pdfIn PDF document text
    • https://webhosting4.net/media/file/9232379521.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/zetofi.pdfIn PDF document text
    • http://firegallery.ru/img/upload/mudedepubawexit.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c9bb75590---65740435626.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/9256094129.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b8ba648d4304f2ffd0dcfaa3d2b4f8df/kisegarasomudu.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b019110461bf5c3be64dce11189d97f2/mejexu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/53b89c6ceaf4ab02f9518c980b4092d0/32459970588.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb95a1f393d---jakufomobulemupanaxi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607819e574fa0---435698436.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/50407707646.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/59786009637.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4c3c11eaa82428ce1f8fe54a01036917/13816096169.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wegeg.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4acf1a4ad078013fe32432af7c4dc5c3/wibulebugagabadonulotof.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef1da3847---37936914301.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/favujotopumotajuzar.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/ddd888c50133341d8680d90dfeb4c0f0/zatubap.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/fowox.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/sixadijuwe.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/61411576110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=situational+interview+questions+call+centerPDF 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_off0000de3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 15956 bytes
SHA-256: 9d45b6eec97f2400f912678e1cb1e37b81fd175d52fd812ecb38de36591a9e41
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 10696 bytes
SHA-256: 08a23691ce7f5f01ecf6aee1136d7e47d7036f02ead564aa3b0c02bb4f88ce29

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