Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca18866ec626885…

MALICIOUS

PDF

96.8 KB Created: 2021-09-24 08:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7cb783dd90cc38991acb4127e2497b2c SHA-1: 5baf930ad786a52d15538ded3fb72855596df617 SHA-256: 6ca18866ec626885d3c7c475e525a2a80f881e720893f63de0065a1069ce874b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://cructi.ru/uplcv?utm_term=acta+constitutiva+de+una+sociedad+anonima+de+capital+variable+pdf PDF link annotation
    • http://whygzy.com/Media/Uploads/files/40020519227.pdfIn PDF document text
    • https://digireg.si/upload/38662879325.pdfIn PDF document text
    • https://adikmanis.com/contents/files/52485699258.pdfIn PDF document text
    • http://fkhd.cz/data/img/54022019976.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496e9eb3806---62589588518.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/lomedakijudof.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210923082610.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/28656669257.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314d49dc065---35483281867.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613655136e481---femijenuvidibapipo.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/80808293210.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613190f1a117c---gadidilabuzuxawiposim.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b837e9c81---rarifajo.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/7609039474.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161495f08a0d34---2886266124.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/zuzilunilarev.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/kugitepizawezeriru.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/wanudawemeluvefopekifur.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/gasodipokema.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/26003379044.pdfIn PDF document text
    • http://happy-land.hu/editor_up/dorofizoxabewifogevun.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2083204d680c67042af23ee5f8e37b32/55980415529.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-15/20210915190401484431.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_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 11068 bytes
SHA-256: 689da38b97cfdfe64a481bb0f5e20f3347e95a5618b907f94eea8cf96238b2c8
font_02_sfnt_off000141fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FA 19656 bytes
SHA-256: 6116f1bf1b32fad19fa9beeb4f7ad76f0785be7d43785a27f379cb2b3d635e4d

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