Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b3d5d3b47e73c2…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 11:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 715a2f29a110e59b94202f5f940b750d SHA-1: 2a1a9d85678a01ad6c706df941482cb851189659 SHA-256: e0b3d5d3b47e73c224dcfd6533ef6b8ea4b3d01e443795c36118157ed0d697a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm targeting WordPress uploads indicates an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly support its malicious nature. The embedded JavaScript likely facilitates the execution of further malicious actions, such as downloading additional payloads or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://labmansour.com/app/webroot/js/ckfinder/userfiles/files/kimejapububi.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f979da6f80---75103804878.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94aab007b---gekelumelelovebunudexab.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3dc56d805---48552267294.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0123997374---sawuwixuva.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878802d9eb---nidaxenuganeg.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6866dbcdd8---80323303251.pdf
    • https://isosklo.cz./uploads/26060401519.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607496c997901---74424201367.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/fed649804c4a503c45c8be4880ad127e/60630088780.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1aaabfda1---36424846915.pdf
    • http://thegioituigiay.net/uploads/files/86267625819.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a7172d709---pezenonanuzokudopadebojo.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3d2146f3---47741474731.pdf
    • http://aliglobshop.com/userfiles/file/zogapawisugujuwilo.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/9e04a64b9b133cdb4a4d565652da0f72/91922954122.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d8f97c42---goruvizekopavadawinulagu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=after+effects+media+encoder+2020
    • 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_off0000e221.bin
2e86fd7fa82f5cd091a3d5cc8508943531e8d2ec51c4613c43c9240f7835202f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 29808 bytes
font_01_sfnt_off00011d9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 16792 bytes
font_02_sfnt_off000135b2.bin
86821fdbb5cfd4a4c55d85084bea9b71ac11219a1b77cdbee67d434f72a3fca2
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B2 10812 bytes