Malicious PDF — malware analysis report

Static analysis result for SHA-256 240ea9d99cd586f5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 15:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e57ef3f6380cd0402dd35cceaa46b77b SHA-1: 8d280ecca1a0a5e87534fd366d336e1d43b29c76 SHA-256: 240ea9d99cd586f5c650d7da941caa41e5e17fcf7ea663cd156b76bcfb36d02b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://myshopekerala.com/userfiles/file/40463836726.pdf In PDF document text
    • https://vozilasavozacem.rs/files/54120508978.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/51914140681.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/gexevaja.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/36037712286.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/rexodupezetew.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/vemobupafajev.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///fiwanasotejefinolabifurap.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/iga2e14b8oromjt27ie9m86d91/19396451233.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/rumad.pdfIn PDF document text
    • http://esistore.de/userfiles/file/9466237653.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826d6d268e1---tixaratikikeboxa.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/95526d028aca18e9741dd4f8e3fa472f/vixurukifibokurobu.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/38382165819.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/tibuzi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39f730ff07---73140118803.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/kudivotafitegeridetaxevuz.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/m1j1q90ja1d9g6141pvbolj4e7/valenison.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0da506fadd8c4afb1d6ea34fb2e71e92/78968993513.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c5085a40b---wubezuzekidararubafup.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/10hhcv8701i407ocpurk12phup/17739292541.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/9b17c4853c9aff86bd4aaf1dd7568550/22095351746.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/zosizusuvudigeti.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/37806296360a265c053d6b.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=small+vsd+in+fetusPDF 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_off0000c69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 16784 bytes
SHA-256: ae674b4af40b996c73a9f8ca779275d22d2a11a4ec9816f3e32527a54ecc1b5e
font_02_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 10536 bytes
SHA-256: de963688c579f86ee8d4cfa4ff17d61fc24fd18e7148d3b94eb54b56f377cd5b

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