Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfc3b774c43e51f…

MALICIOUS

PDF

77.6 KB Created: 2021-08-28 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bfddf38424d79a330bc1362460621f6b SHA-1: e69516ce90e7e4835e7ce3e357c48be165040d9a SHA-256: 9cfc3b774c43e51f237178b86218083bd57992a8be2be04406e2d1f1fb51ec43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to potentially harmful sites.

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 http://heldermusic.nl/ckfinder/userfiles/files/17033397089.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96291e919f---kujexebokojuvov.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/33852148974.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a528f1ec04---rinefixamivikib.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/gogulobosi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5a283e082---52825384297.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jvlclaoio3iet47b0msalk77q1/59428957479.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/77148724075.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/jetisorelafitiw.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/674ef051390e87e6ebcc796dc5f619e8/berapusenewexaxoresemog.pdfIn PDF document text
    • http://dermatologie-chamonix.com/userfiles/file/66060203609.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/dogewoluxusufovipif.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/f4107ae820dde6a25a9d1e640076ef4c/6313324465.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160863a30f3b9c---37319404964.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e3a992f6e15c2708701ae8949ff740db/retajerugep.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e268a81b5c5---tawapidopep.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7abdb06611---ligijosamiroj.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/66685318572.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gejemiduwiv.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210619021508272.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lovifimerad.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/67513939891.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3qmo0742qkpsk58gqku05i32sh/tarotag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=if+you+get+your+license+suspended+how+do+you+get+it+backPDF 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_off0000ccf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 11380 bytes
SHA-256: cbf01bb80425ee80100397749c84cac829bcf79385f710793156a0fffeda385d
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 15944 bytes
SHA-256: 9ecdc9febd86c07205b76dad04cfc41612126d349d9d06a151d9e759fb8a1843

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