Malicious PDF — malware analysis report

Static analysis result for SHA-256 de579d688eb0807f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 23:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 759fb6a892e6b22f4fa58017c71cbce7 SHA-1: 2749989ab6aebbf933811c08664f15e391411e1e SHA-256: de579d688eb0807fa481be27e8e879d23ee7471f45574a36ab4b1621115c2a8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, potentially for SEO manipulation or to spread malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=clear+space+on+firestick PDF link annotation
    • http://hejia-ele.net/upload/60904337373.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/72434797919.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/65020958904.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/zofisogituvimikib.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/49615407703.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161327d484d160---18389998752.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/31561545784.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/78984203820.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/vudagevizovifa.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/bawibeziwupesuvureni.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/20066947584.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a51e54f28---kigotozudofutejam.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/fevodubu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161313a8059ff0---65919382936.pdfIn PDF document text
    • http://lulanjina.net/upload/files/gidomokudopakan.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/wizolokevikeniki.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/tipawawada.pdfIn PDF document text
    • http://vpsystem.com/files/fck/pekogefixawafomar.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/topopuragapodavuv.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2cec0a9540448aefe5e6e97cd6900536/30650570859.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630730766.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/fenegudabavanazapa.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/49237911175.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc81b95c92ebbd36f9353734a9f9f58b/lodota.pdfIn PDF document text
    • 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_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 17696 bytes
SHA-256: ae70237da5f819600e4e5a2a4d04db7f6b02e9513e3ff0e78f5c66b957d22bd6
font_01_sfnt_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 10596 bytes
SHA-256: 1226ccb61981b34160e51c547b824b31b21c985ae5aebc347e5fb83130e96a84
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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