Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5866fdc3d65a1f…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 19:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c32b1207d952fba1a20d4449cda53bf8 SHA-1: 93191b3faadbb94ed6f7dd802b6a0b5687ee6878 SHA-256: 3d5866fdc3d65a1f2f91fa23c329cf2645d815acd878102b78337e73d360b91d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ac209ba05---98239420304.pdf
    • http://sparkpro.lv/content/file/jejefejerezefajobuweravaw.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6fe45e906c790f75b3d912e58d9454b0/timenogatagoxerutamawamu.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4bb99e768589aa12a9b20b75d269b9df/8648889095.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2b232cd11f00cec3fde6075832b9fd4e/gamuputeda.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082101bca2f9---sidozesad.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc75191ed1---jelozowuwarefagojumo.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/582ve4cc75qagp9d4p75lh5n6v/xebalokugujetenumadusitaj.pdf
    • http://consulcongress.it/uploads/assets/file/mubek.pdf
    • http://ahcxdq.com/uploads/file/281550467999.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fb256b7696bf9458723e5f1264875206/sajulewotifitaxub.pdf
    • http://cz-synergy.cz/data/file/95524343282.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2541f3754---35247128016.pdf
    • https://oklogistic.lv/upload/file/fufagudipevokebifinuta.pdf
    • http://beiwendq.com/userfiles/file/wezotiva.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/zigekifezuzuzetusokaxuzoj.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2305aa4b4---25706096614.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=healthy+baked+apple+slices
    • 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_off0000ee54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 16792 bytes
font_01_sfnt_off0001066b.bin
add535853b92b79dc89ff0fb8c77ed1779d5f5f40b3fa5029ba7fb3d0b702e58
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 10624 bytes
font_02_sfnt_off00011e98.bin
ed364034effd5d2ac300085fffeb3b7247e5ac6ab9920e02451d3ec6a7b15190
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 18840 bytes