Malicious PDF — malware analysis report

Static analysis result for SHA-256 4370db6f73e261b8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 16:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4e3ea66ededb4967dc63c71f23745a9 SHA-1: e9906c7eb48366fec8db3efc485bbd32c6872f3a SHA-256: 4370db6f73e261b8e611000faed982e4fae7b3f45a122d9d726fac44f059afe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://engcaphone.com/_UploadFile/Images/file/59412802540.pdf In PDF document text
    • http://obras.ru/sites/default/files/uploads/batuvezubaxuxe.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/91305542155.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/zabejasesodapusirizara.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/zakapimijuribadoso.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/ralopadarijo.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/70031874962.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/36504330865.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/ditoza.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354636ea0bb---zatazomobomovupilodesuni.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613475d03f7c7---gometonira.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/nizolupejataka.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613889606f4cf---41284459220.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/kumureputararalap.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/4923995331.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109010417096010.pdfIn PDF document text
    • http://ge-mak.com/files/24840865522.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/bepegu.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/1516156408.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/nugejukifetuw.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/dimerijosew.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/xuribobaxapi.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/33117999507.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/34336708972.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/mupidemas.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ca5692ce5---17850528912.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/wuxemurasufasebogubewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=questionnaires+and+interviews+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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 16820 bytes
SHA-256: c61766308e25f4447da5d2c608f9d8cbe8c8ace66bef58646457f3f260235116
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 10756 bytes
SHA-256: e74e699607617b968f903bb64cde99057fa5ff52864311c08cd0828ef25fd3d5

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