Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef782322af758530…

MALICIOUS

PDF

76.8 KB Created: 2021-08-12 19:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2392ec152436d12b17dcc025c63a0e6 SHA-1: 2847f7b3c685716d1ba47254fe143a91dac95c58 SHA-256: ef782322af75853004b63c62eae0c1aa426fb91cd8c88f5fff91c87e3da686f4
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 distinct hosts, many of which are compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of using link farms for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7ac87e8f05528098e2f337043ed41807/suxuzoboduxozegewiwun.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/50c709bcbb60ca30745254f176388d47/dipanavuxovuxevepomup.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde7cab8b0---22333217667.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/n20cdgrho92q2ff6m29srj6an6/29604711497.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160844df3e7850---gebigi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3efs9651n7a7qd34ccvnh4ve10/tilowudonofilipevi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/85k23hrr0bo7chr2r8debl2lp4/52485330770.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0b90eefaa97f1c4e15c65553b8fc3057/2895266133.pdfIn PDF document text
    • http://gifarlcm.com/upfiles/editor/files/99349665409.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9c3c3b46---worusuxo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3f3f9740d---70853458926.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/vofogilujopodik.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/65898902738.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zigavinafimavojit.pdfIn PDF document text
    • http://greenbrier101.com/userimages/52280838326.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a361d6e8a3a---lafijazaferopanugi.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/difeko.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/32052540545.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f5b5830424285aaadf697bb8d11866fc/50639452410.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/begezewipi.pdfIn PDF document text
    • http://cga82.com/admin/File/baduwubes.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/36279907508.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/66826685565.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/tetukusesonekizu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2vqma3nne63tm2acuull3hhma2/90128359333.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/95577755304.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/11804360109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fgteev+bendy+and+the+ink+machine+chapter+5+part+1PDF link annotation
    • 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_off0000c5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 17248 bytes
SHA-256: ed780c696f612501fd23bf2fbcf0d276fa20b02ed24a6141f242edaf069b1653
font_02_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 11200 bytes
SHA-256: f7db3dddf1431e2e211ded28259ee4814ce406d03d3936eae9dd0401cc68a3ad

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