Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc374f2f539293f…

MALICIOUS

PDF

131.9 KB Created: 2021-08-16 07:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf5b63af195fa516878895aa68773ebf SHA-1: e09bf34eeac257835f1ae0fb4825e320a39bc0ad SHA-256: bcc374f2f539293fab7b66c404033ede8b38649a05f0f1459f0954842a3a9310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. This structure is indicative of a link farm designed to distribute malicious content or phish users. ClamAV and the ML classifier also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b407b46143c---33468378158.pdf In PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0d25d6a19034aff9b9cc2ad363b665c0/makirikekorawiregofujogew.pdfIn PDF document text
    • http://ournextfamilyreunion.com/clients/4/49/491fb30de6d8464ca6518fa43aba5bd5/File/46414017216.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/79569210316.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160769e8d2e65c---waxifamatixurejowepafalat.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/46389565428.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/21148081717.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/lagidudabunaravizo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c8fa50a2---69336656608.pdfIn PDF document text
    • http://industra.sk/userfiles/file/71507805809.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/43362055523.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/fn2n04t4juk68ki7in19tnk52s/14596335149.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/titujuvimikovibuzoponuve.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a854a2107a---44186504749.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160983b26b517a---xewopekibazepimivizotopuf.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c777e7b15e---98390587570.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///98305116783.pdfIn PDF document text
    • https://angkalaris.com/contents//files/23862381387.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b813ca123c6---figalonokidetajukok.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/689576ddaba8afd622edb755d6869428/kebov.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/kavivukibafufij.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/30203534568.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/rudeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=diagrama+de+bobinado+de+motores+trifasicos+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18310 16172 bytes
SHA-256: 4d323bb249e88c398f0095f889563dfd8dc5db968c63eff0834307f32c320b32
font_01_sfnt_off00019890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19890 11060 bytes
SHA-256: 860418bdc1aa2734e0b557c29f7abcc4d5853edd3c50d72525e63776852cdebd
font_02_sfnt_off0001b1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1E1 20272 bytes
SHA-256: ef00777b8904d641f66767fdf0b052d96b1cb01c3a77d426ff6b5c691eddc3d0
font_03_sfnt_off0001e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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