Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fcb9673469b259…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 07:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fef666b18e29fc79d0875a5fed44e174 SHA-1: 6df136eeb3c775673a61cf32c37caea63ae51639 SHA-256: d7fcb9673469b2594bdfb53095ebd953385c4db6cc1ff56d65dfd61f4422e3c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.hkfew.org.hk/ckfinder/userfiles/files/kulelodumibowonetap.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c674761d---zuwodudit.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b245eed369---3840163452.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/55785498408.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/bamojesokutunevazazuro.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/riginumiroletefafibadad.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/5149046365.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/silam.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/10127724288.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d489d1dd9d---56563287011.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/1975294959.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/didil.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/xilisosufutovu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ec22201c---41853620354.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/sasesolopugakalatugepov.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/12826027523.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/darifewowago.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/60576090231.pdfIn PDF document text
    • http://canoeing.by/pics/files/loweligajiwe.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/kavurikifetotebugezota.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wadegukiva.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630834987577139934.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/wuzinatiwepifiboxonuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=windows+365+portalPDF 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_off0000c5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 16428 bytes
SHA-256: ebfd29969c8f831e474ee330d0d8372b24db75b992ad81a565dfa73666dc6d98
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 10804 bytes
SHA-256: edf4398691bf7f7c1ab5b8c5da22a729576bfa20566681d57020a08c0fe58858
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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