Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e510721691c688…

MALICIOUS

PDF

92.6 KB Created: 2021-09-01 05:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 224722138354e93309d553b72f6425e6 SHA-1: f11b37361769fcf4a16909f24336e6d90d9800a5 SHA-256: c1e510721691c68867a658b636e0cbbc38a5d13386400a9f9e2ab20591498e22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, forming a link farm. These links likely lead to phishing pages or further malware, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611267c8071fd---rowipibi.pdf In PDF document text
    • http://goddesshair.net/upload/users/files/gixajeruvo.pdfIn PDF document text
    • http://calebdobe.com/clients/875189/File/46951630032.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/pofoxaboseravedatirobojem.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/6088483126.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff6669245---36506851473.pdfIn PDF document text
    • http://video-cycling.de/files/file/jolekozojivusujolax.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607324f8bca2e---rowukusesisoxokazej.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161115f3b8c74c---sixujo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a57e495df---17551774329.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/sinex.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/waritomikebabetesesoxofuk.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/25058526285.pdfIn PDF document text
    • http://sivam.pl/files/file/86638615065.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e497956c---86069251844.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/pibulinamuv.pdfIn PDF document text
    • http://voijin.com/userfiles/files/34954870969.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/kumixezumaroturefuberakaw.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a617c3b5802---24007431974.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/raguwedenojarijubakumij.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/nibax.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ea30104c---53542804656.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/gorur.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cimuabi7bp9283gpf23vtuvgll/59139239487.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/26910482982.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/40450ca49a99c2db4c2add47c34c687d/52561694756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=20+mph+over+speed+limit+ticketPDF 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_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 10816 bytes
SHA-256: 98dd3d12010a1e226a6a2564eee95a7b7c17f8c94cee6cc940f4d5315808a033
font_01_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13393 18528 bytes
SHA-256: 64fb97a853a3c9b32407cb58737e7fb676294ed973a27abbc4d32dbb0e2f74e2

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