Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5d63aea067dcbd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 06:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8cb006e6ea2d7395d49c9095ec41d8c5 SHA-1: b07e4fc62b20cff57a5bc84be2712a627c2c2e8b SHA-256: 3c5d63aea067dcbdaa2e279122ee88e8053a515a53e4eada8cf9c09401241d2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://by-express.com/upfiles/editor/files/bipuzojekobewe.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c873cf7cd78---17852995010.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/71636549142.pdfIn PDF document text
    • http://foodchemsino.com/d/files/wugexufa.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/fagetu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b82594d95d6---25918748659.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/fuxuv.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/foxiziwus.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c58119ec89a---32468120207.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/doxaxida.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/25151162872.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ce0658c0f57873dc4687542e50de2cdc/pazevososuzojaloja.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f466a0f498---godenazilaponuduvumewurep.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/fexekuxopemubarapusoko.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d490b86be---zibidiku.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111e50093173---29779519837.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zirotadezudo.pdfIn PDF document text
    • http://imi.vc/upload/files/1126553623.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/pupebo.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/39439523317.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/zalujuvegig.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1c4e12167---96617185372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=albert+einstein+life+story+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_off0000d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 18492 bytes
SHA-256: 5cc2b638806e4449086dd9067dddb5e22de108c6be0806cbb64f447e5ef3fb8b
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 10564 bytes
SHA-256: 1e97eb3d8c39ff21c94701714fcad9ee6e82cc31ff7ea8dc3ee5d2051b2deaf2
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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