Malicious PDF — malware analysis report

Static analysis result for SHA-256 3508e0196c1ba657…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 20:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09eb38222f15c193dc6aa9926651e37b SHA-1: 579c7a93c4d710153ec08cb6e39e78a24fafe76a SHA-256: 3508e0196c1ba6575008a33158b729c191b8e6bca95f23527cd0d4c3f6ca9257
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to lure users to potentially harmful sites.

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613777b629447---zenonusejodunisorawu.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fac3eb095d82dcb378ef24ca0fec28db/89944681330.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/5881348627.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/56022296866.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02682cee4---56443901201.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6b2ac2e97---46719130991.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/dumotuvud.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/67862128235.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9112b20---dusitefegepuv.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/lebitofexako.pdfIn PDF document text
    • https://clickbox.ro/images/file/lizexagepagugolodebega.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/41nh12di1oe92hioooodav5fqg/39215184788.pdfIn PDF document text
    • http://biomehl.com/images/content/files/3705487195.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/40011050947.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/pazukafaja.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f9ac175b---80397152320.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/49359982582.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/melejibobajado.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139dbd3c2b14---6557923804.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/73100873129.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/2519588418.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/82329934162.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/niwefelupubek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+fps+offline+androidPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/54016832670.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_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 10544 bytes
SHA-256: 702c15315e3daa6f4458155e52adf0e60b70859d2898f7415005d35bb3b6c13b
font_01_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 18316 bytes
SHA-256: c573eb99c8af15693f5f6b1d83def7fa6c8a94ab123117257dc4bb03b9b3ab34
font_02_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1