Malicious PDF — malware analysis report

Static analysis result for SHA-256 b447d39aa4b8712b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 13:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b520933f83e300f58f7d1d5c85a64e5c SHA-1: 1d5e7b1eba3163899b5f831cfd21f8dadc260f77 SHA-256: b447d39aa4b8712bdeed55ed9c1b07b3996e8dd76715eec6ed963cb73325c735
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d35f9c1cd55---depimalegoko.pdf In PDF document text
    • http://tipiland.net/upload/file/37249412060.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/44527509571.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/302fa7e1bb6d74a6e3f1a9d2d8ace04b/78140311584.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/42794380837.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/opq34m71p97mrj6hkc45atmt57/33268872089.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630352048.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fb1190dea91fed6d9519986abcb9d672/95518528251.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/fusepovirovenizijexip.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c76d022a---24583385522.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/kugetite.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/25535838143.pdfIn PDF document text
    • http://premium-h.info/files/files/84377641108.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/38181421850.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/fopulizezowipiku.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/94894341026.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/wivifudikalokibu.pdfIn PDF document text
    • http://capri.lt/userfiles/files/91619720027.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210828_12075C7F0F2A8CA4.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b24603b56---sitawoguwavuzimixu.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/70078744425.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/fukilewe.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/54251909876.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276eefda18b---zujijeremawubip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=50+tons+de+cinza+pdf+vers%C3%A3o+greyPDF 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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 19736 bytes
SHA-256: 66e58f468a57d21f9a4942711afa39c8ab424c8e87b6ed186ac4fd748868c2d3
font_01_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 11412 bytes
SHA-256: 08828fba442e46bc791062fecbdec70f7b3c507e2102a6bf9a7920a701c4090f
font_02_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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