Malicious PDF — malware analysis report

Static analysis result for SHA-256 c665e072590fdfa5…

MALICIOUS

PDF

84.5 KB Created: 2021-07-16 16:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dc906f9b243fd4b2e4cc12fbbb2c9bd SHA-1: a107e1ef769ad517f771893f72418479f34111c3 SHA-256: c665e072590fdfa57c19e239907942726f073d3c215cc8bc46b0cd0cc7c80dfa
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/600apaqf741backqjqk2a17ou6/badedafisaxo.pdf
    • http://sun-green.de/ckfinder/userfiles/files/95701097278.pdf
    • http://healhumanity.foundation/userfiles/file/83017490552.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/voduninokujoworav.pdf
    • http://adveotec.com/img/file/sujilabavep.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5e66930c11329ce8da732a2ffef1e382/rigutenifarirojeferunigu.pdf
    • http://solarissoft.com/img/userfiles/files/nujetoviwemefuzojoroponud.pdf
    • http://bollywoodsalonskokie.com/admin/images/file/85059725188.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a926cacc0b---10432444840.pdf
    • http://armanetti.com/images/5383043903.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070699c6bce9---medusisegomubipixu.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838940b953---wivitutatefuduwuvegatu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7364847ee---93274267190.pdf
    • http://nitexprofi.cz/userfiles/file/bekafezafofavoso.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f21323f60f60c61bc84ce842838b0bea/kekegewunoxodasalopu.pdf
    • http://kimandyoo.com/userfiles/file/mupatakamomaseperafetiz.pdf
    • https://stopserv.ru/files/file/wopumefopegalunu.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/lomavo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4eeb322da---86686573363.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/mipujivetesorolozeno.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/idr2h9khub1oc4a4jtfajafigl/jekilazirenajotinetizedug.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c786882cf---juvajupovexalovat.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6bfckpffbrqo0r5avuh5608s0t/46786901618.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0aa35d44d758329887bc220700e90a1c/fogawil.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///mitiduxonovubetisifu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=obiter+dictum+meaning+in+law
    • 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_off0000e61d.bin
324ec2439843c808c661d388906a5e9bc535766566194a1ba1f345df79daa083
pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 10776 bytes
font_01_sfnt_off0000fec8.bin
726040e172c109656df077149667b3e4677de1b51cb1a2d70b38f1686879434d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 17616 bytes
font_02_sfnt_off00012cb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB4 16792 bytes