Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28940ebf8deaf65…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 21:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a38ae467970b38a8fd39edb5a7af57f SHA-1: ca63e41cff638a48788acce1afa7f06c806ce1d3 SHA-256: d28940ebf8deaf65f2b8998d9836a5d43adb1b851f6777bacdfda123f648ec68
164 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, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting it is designed to host or redirect to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc47d27f0---8845614105.pdf In PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/37214021667.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/nipexavivorexezuwazuzuv.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210907180011441.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/12261080260.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8f9ca57b---gikipibelizagonapaziseser.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/nivevalejusodin.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/xuzif.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kufiganudetavevat.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/77073792895.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/27713970814.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb78c04b8c---41682985207.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/gizelidukimokugipewibo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366924b7cf1---rikejapuxiziw.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090111184544.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/dowasigexolelipa.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/jerek.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/jitataxopaxupetakogabi.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/37090526909.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/fizevowovux.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/jaxirigijin.pdfIn PDF document text
    • http://glassick.com/userfiles/file/zetelibufomidudabenuj.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/9150315528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=3d+imposter+among+us+horror+gamePDF 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_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 16664 bytes
SHA-256: 9cac289ef969fe009cdf58d07228bc80d2feeb8106b8317f596b86be56b7ab1a
font_02_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 10968 bytes
SHA-256: cf53ab57b1b1a679583eca23127c2e90df4fdabca0fb85fbfa60093e6dec3fb0

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