Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5766e160dac34ee…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 11:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8fc32018fe5a33bb59857d88a559939 SHA-1: ac110192d7c98d79908e282ea53da1f600a8b23b SHA-256: c5766e160dac34ee9814a5d83133cb40f1d3ac3559c1546519e714c82705a441
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://luminex.pl/upload/file/70073600927.pdf
    • https://hoalavender.net/upload/files/10435565969.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a224854a2d5---wekokinigowavi.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/67581136356.pdf
    • https://alate.org/admin/fckeditor/editorfile/vobeworipapivabikibozajo.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/1ab26a93dc8087b424f68d4d6009eafb/7209497922.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b480e69ee6a---47616420063.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/basemigoputuf.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609868b2cea4b---81712544502.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb8035dd3---94130941587.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/38053093112.pdf
    • http://archi1919.com/smlclub-files/file/73440046812.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/beht9dblqatrn2kvpblkn35i73/xanizotopofuw.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb2296c75---13845169289.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160704635146bf---jekej.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ed4a63d---6012291340.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d176c980a---61679969387.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/2gclkqfa3n3os861d1iafbre7o/jixuvexewonem.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6593ca7a91---38316356009.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210607192125.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a995710247---ligupimowu.pdf
    • http://zuche0551.com/upload/file/22425851535.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d55963eb1306d2ae839352b4ed5f27c/pononidunodozefixadumofum.pdf
    • http://exlluprimebrochure.com/ckupload/files/66020609779.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18ef1b91add2c071133b8499095d18f6/pegedolagirewas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+prepare+for+logical+reasoning+and+data+interpretation+for+cat+by+arun+sharma+pdf
    • 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_off0000fd40.bin
d0daf82d3a867c0699cbdc3d81aff4cd9fc8e3d50a5da6d1d0da548ec35e2ba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 11496 bytes
font_01_sfnt_off000117df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 16792 bytes
font_02_sfnt_off00012ff1.bin
d2ad8b1ce0ed82dae6dc830b37c92c4fd9741cd119c519745713cc0f5c2fd58f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 17652 bytes

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