Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82f687c13d99156…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 07:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09b7ab0c6d0dbbfa004b04c605a9b8d3 SHA-1: b910a4a7c4870c51018742ffa7bd466cf7e7eda8 SHA-256: d82f687c13d99156dbe48e5e22282196524175f0114a696d50e11f8ead4c57c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=embedded+software+development+pdf PDF link annotation
    • http://freeorden.com/media/file/wufatavogega.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/musokugago.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/ravideligaxegideked.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/65369959392.pdfIn PDF document text
    • http://wwstationery.com/files/file/54076420197.pdfIn PDF document text
    • http://ty-int.com/files/files/47238392797.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/sufarategipi.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/26800520846.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d3f73e2e---lazefoje.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/kaxukagodofokema.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/zafaga.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/2388c7e894505a878e18d798433a50c5/jamubaxisubusedeb.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/29006151151.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16117a5077b22a---jaledejufemawizewakuvuxex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d766d012c---75636201816.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0f5e7d9a1e204ca5ec8960a44390cfb8/tijimurisagojevaxeraz.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/bojerolagajediwuveri.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/somovenekubuwepave.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///30096149042.pdfIn PDF document text
    • https://vestol.bg/files/file/58013906540.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/33375059250.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/340668634.pdfIn PDF document text
    • http://fruitsad.pl/images/file/99945474231.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/93739316743.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_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 17040 bytes
SHA-256: dda6a18707691e67be3dab147f5203e099a8d54f052fceb1d103ecc5b280cf3d
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 10844 bytes
SHA-256: d8232edd8bb5f2d42f678c72542d7bc9633912075e69a21b67e5253f05d88b86
font_02_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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