Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba9d4f533835d61…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 19:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b910fa98e2cc352468a729243ca4f260 SHA-1: a6b9f5afed2d30b095f320d9e741333f8fda772c SHA-256: eba9d4f533835d61db7562509882ad11a681ba17d5a22f3af40358e5d23e5352
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links align with techniques used to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.skk.com.hk/admin/ckfinder/userfiles/files/58554130179.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e130b018fa92d7209a8e44e8a005267c/2904489012.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1af69ddbac248a454413313e8c1ddd4a/35677607008.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/93816578029.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/268c112a21a04fc018934d37cfa8c9b8/zuperopenirema.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/zorenotamidobefuf.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1d14be02---65197233094.pdfIn PDF document text
    • http://inphilong.com/upload/files/971075249.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/21769107209.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/25130853045.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/sasagofifupibad.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/80308644127.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631751303.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/80474760563.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6368ca185---xofituwuzejabukeziranu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380088f0018---91415177921.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/58999769621.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/dawofavelomapaxu.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/gawivizemupolanabe.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/disovode.pdfIn PDF document text
    • http://samtle.net/ckupload/files/35509433937.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jimepaxilo.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/14426395079.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bff849751---bapijawibigojog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=creating+character+arcs+pdfPDF 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_off0000b7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 10764 bytes
SHA-256: ba58495e33944a3897a6e26d119faa275330fb91a5d85804c25ed95ad91be61e
font_01_sfnt_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 14764 bytes
SHA-256: f6d027f565a36dfc000909a18b523a8833c527e14a5e31c5e56d4635cadd56ae
font_02_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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