Malicious PDF — malware analysis report

Static analysis result for SHA-256 9567296d5e35d8f1…

MALICIOUS

PDF

92.9 KB Created: 2021-06-27 06:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 017eb146194d6c7501df8ade4915f928 SHA-1: e214c929300fd32424b1f57baefbfe615fc846e9 SHA-256: 9567296d5e35d8f1a1009077e1bb0c7c86728990e4c7eb03605803a5a2e71587
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c8abedbef71db40e46cfb3760206577/28418240326.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a951daec0---nopebexurorevena.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sjvqf7tgilph04p0ntevp8hkri/zufebuxubegifejujebumi.pdf
    • http://ajivikafinance.com/userfiles/file/rupurikanefokesexu.pdf
    • https://vegan-eshop.cz/data/file/duvupigezosuniletobi.pdf
    • http://nsdadventist.org/FCKData/file/mufawonidesofewodumo.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/gn3hn1aod8l3je0af1anms90c5/teziwofazabekidemadejude.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01813eb9b---62361980415.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/99707743962.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a100bfcfa02a887b3d43c999d8b38f71/tafegeseluvigu.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5fad2536adaaf3802c8f074cc594cc9e/lolonazasipex.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/bizafoditoluluw.pdf
    • http://hilltop1976.com/clients/24685/File/99325365900.pdf
    • http://hoshitorionline.com/uploads/files/87493340298.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607640286c4e5---silowimerifoxojafemaf.pdf
    • http://termocity.by/pics/files/18276428437.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/50fa6f64b316e00cdfaf7f2124ea0c1e/62732789793.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c068f800e41---22652955363.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h0hpmuogj6be3792d6t78f2ia2/34302525034.pdf
    • http://sbnjl.com/userfiles/files/6704648428.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f6192271bdfd014499449c6a7399f149/gufabivanabi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=monster+legends+best+monsters+to+breed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 16792 bytes
font_01_sfnt_off00011f0c.bin
8bba855e5e048540c0358fc2560e76fd36616ea22aec75b9476f783db3770e2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 18048 bytes
font_02_sfnt_off00014ec9.bin
b4d21166f0ab865223bcbe725d32b11e8a9296348021dd8a367b70f7cbed72ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC9 10472 bytes