Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8433777636258c0…

MALICIOUS

PDF

73.1 KB Created: 2021-09-15 00:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9de9d4511ad5d44f2dad6612886d707f SHA-1: fcdd33c644d5bcccdbcc77077cd54654f15eb2f7 SHA-256: a8433777636258c0558f40c0b359e225cb1c8263bbec9dc2d112abe6bc518403
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://lawrenceyezersky.com/userfiles/file/17267450411.pdf In PDF document text
    • http://viviapalermo.com/userfiles/files/matamijezeti.pdfIn PDF document text
    • https://rais.bg/uploads/file/diwozuvawatewasevoxipu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613405c6426da---85018752349.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210914_D2B4311F714FF089.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/38796852534.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/69038177845.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/73837636423.pdfIn PDF document text
    • http://sieuthibds.net/images/files/mewekiboso.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/62926837759.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/90342652620.pdfIn PDF document text
    • https://alohasafaris.com/files/jemonalinajazafajebuf.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/mokeleforigutabuze.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210912204916.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/lerumojos.pdfIn PDF document text
    • https://mkontroll.hu/File/95651564538.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb2f208570---kulikosurukedixo.pdfIn PDF document text
    • https://projetovm.com/uploads/files/73578878723.pdfIn PDF document text
    • http://seamacros.com/upload/file/84789004112.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/29220688578.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/75961214168.pdfIn PDF document text
    • https://interconformity.ro/images/file/71428511489.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/94126713516.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/dafositigudukasuvixu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7781d18d5c2a9686b0d5fde8a7fb9f8d/81603258283.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/37764322801.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/43694620469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+transfer+music+from+android+to+iosPDF 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_off0000bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB7 16120 bytes
SHA-256: 7edf4a080c2d657e79ccf7e0a5ad94da57d517dab9424dacbc0c749b66076254
font_01_sfnt_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 10768 bytes
SHA-256: 36ce21a0b44d9ecb9a5524efbaf852fc6796b7a80ef971d71ff28e511e0aa064
font_02_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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