Malicious PDF — malware analysis report

Static analysis result for SHA-256 0467b91e6f183dcb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 08:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71ac2efc1760558b7214d60492ede210 SHA-1: 22195026a1d4ae92725a08a419ffea693667f911 SHA-256: 0467b91e6f183dcb829fc6fbd2ae390f8b2ce93d0041bf7c54a3cb88a9a7fb4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, including compromised CMS uploads, suggesting an attempt to redirect users to phishing or malware hosting sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/xorow.pdf In PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/negop.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/46670190715.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081ccd0461f7---58583927403.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16105193762ce0---gajujawij.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/4656413183.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/81718168959.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092030dc6e58---15801975383.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/13600177063.pdfIn PDF document text
    • https://projetovm.com/uploads/files/25551377889.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609272797496f---fogorido.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210617_F2EDA372E01F082F.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/7140081056.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9dfd8e0f4f8ac6bc6038a1efd8fcfa51/30200244482.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/18167073663.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/90073765139.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/51355386870.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/21d51d0a304a37ebd7aadfa533fe416d/zapivejililoxi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c8290c602---lasijemiledokibejipuwu.pdfIn PDF document text
    • https://langumeistras.lt/i/File/26564918573.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/25592325569.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/90418576536.pdfIn PDF document text
    • http://distributoram.com/files/file/kiditugixijefonesupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=drinks+vocabulary+list+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_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 10996 bytes
SHA-256: 10615afc6176400265283d1d03f091c2dff2dff0a0bbe115a9200ee5606de796
font_01_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 18660 bytes
SHA-256: 28954d92e4a288cbe290c4a73dc7ac83fc02cc7d92ed91713539e4204bbb285d
font_02_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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