Malicious PDF — malware analysis report

Static analysis result for SHA-256 451fe42cfcc630e2…

MALICIOUS

PDF

81.0 KB Created: 2021-06-30 20:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36f4bd2a8ec54e7179f8e072e84e0896 SHA-1: dfce3d5151d9002ee679c602fcd325a99d91746f SHA-256: 451fe42cfcc630e2ef77effb1e2ade9f5ab404e9d6539c408c0a51fa0e9a062c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to host or distribute malicious content. The presence of a link farm on disposable hosting further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8e4411cd---wiwuzewipijolixaxixapezew.pdf
    • http://blevy.com/ckfinder/userfiles/files/parilafidakekusufo.pdf
    • http://edwardlankin.com/clients/86087/File/59150280233.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eab0a9f680---roxezetimotaxejajexetenad.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2a2ed55bdb0d5b0806ebf467852e2327/fotifomamixulozowonodirod.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/du7dsgctna0r8dr4kaitfr505j/34082597051.pdf
    • http://100gastro.cz/soubory/files/naxojibiluditojawidix.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a047c6b49a8---kopumit.pdf
    • http://www.yoko-ono.be/images/userfiles/file/5539408135.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160742fbee3fcd---95440641930.pdf
    • https://red-adlay.com/upload/files/tetofepatodusa.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba661dec6---75439151120.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67dea28a75---zekeka.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e6d63819a0ffce0835c8b20c56f3a781/konazojezufa.pdf
    • http://www.pics4us.de/userfiles/file/13477981312.pdf
    • http://auburn-properties.com/userfiles/files/4197782308.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ff2b82113878fb1e92bcba19c5603a6b/13335182307.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5d1144fa5972050bf00e9d58d11892cc/sovoritegekusifelupela.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16212609743296.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e553ab162f---kakomemudexotapuvosag.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974ec46b7bd---xepibipibili.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/85639142163.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tapas+and+tacos
    • 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_off0000d9b7.bin
dc1070f58b11e2726facc08898f8f08408ab946207b2bba7a156769cfda94df1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 17796 bytes
font_01_sfnt_off00010897.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 16792 bytes
font_02_sfnt_off000120ae.bin
64c210eb1ccc2e7b13608dc0e58cc3c6a30af92eb7be6276f56643c6048b8968
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 10100 bytes