Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cbeecd5c74e91d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 03:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 526c6f4554352651d394dbaa2f236e84 SHA-1: 731caec8edc5028a79e2a50f711c4becdb151303 SHA-256: 01cbeecd5c74e91d7df88318e97158ff534eb391f4ffb33a913b54b0633c60a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malware or phishing content. The embedded URLs, such as http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160833c4634cb8---4194771712.pdf, are likely used to redirect users to malicious sites under the guise of a PDF reader download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c528373c2d9---67550178939.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/4qh2b7qiumutmrsplcomenp5qb/12208191943.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dugaledetowabef.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a642049d922---72730165781.pdfIn PDF document text
    • http://z500.si/files/36664485858.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/gemitumetujowe.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/be9ed24c9279d27ca4bf5ac31c36e367/11572575252.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6c0f6d225652a84dfa2f572ebfcb8967/42597728578.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/44b603895d04ecf4804ee7a355c85083/sedepusosebovepugu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/32944572519.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/50011242602.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/h3igcansrb3ia9ei7b08fmd305/53460919087.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/55505647453.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160833c4634cb8---4194771712.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96a10815b---bigasiwazajitudonibovil.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607937b279fa9---29863729632.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/99879214725.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/46073181277.pdfIn PDF document text
    • http://gibisch.info/files/files/35703230004.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/86000532120.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f14c5bf0435---marofuwepisezugasorogasu.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/50920855550.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4f7ead6abfbf24ca21b86c73764e3659/289130387.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/64222230841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pdf+reader+apk+for+pcPDF 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_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 16408 bytes
SHA-256: a597367f93dd332c85e78e00c1ea6b839bb63040af2c214538609043ec701228
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 10200 bytes
SHA-256: b105adc6eede772b7a04fb2960207160377bb6b8df97dae9ad11a955fec1f164

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