Malicious PDF — malware analysis report

Static analysis result for SHA-256 6768afb99f200f2b…

MALICIOUS

PDF

89.2 KB Created: 2021-08-13 16:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d75cc89b95d3e9c8e6cf7413ffea99e SHA-1: d9121376844beb93788668ffcd36e06ad9941280 SHA-256: 6768afb99f200f2bf5a72747416f8a1a13b7e7953eca5b438ae12dbb27f82f8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, it features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb15000d0---gisufewebow.pdf In PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7c1260f36265f7298406b6cbb800823c/31473686054.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/lixagilefozafiz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/27486887776.pdfIn PDF document text
    • https://kawanmto.com/contents/files/gogijodulutetufape.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/23213662950.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/75615201718.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/39315886470.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/15a61a6f25a72abef596574bb8315e09/99462817120.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/95309816364.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/gagodotorutigugigako.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/31856180.pdfIn PDF document text
    • http://limoride.net/gallery/file/jigerirudituwidop.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec374f3742---37873003128.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cb6c664d3bdbed5cb25c0b76bce856d8/91256510994.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/9082646960.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af4108787---50815805122.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/97v16uul5d7fqfarvpltht2h39/zifogufijojaxobenoseb.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/69999651532.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/82846080105.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/93351004441.pdfIn PDF document text
    • http://metabolit.ru/files/file/muvadik.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/3279187257.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210801184304357525822.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad552711a9f---fenif.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/646ba345079c740bec42fa0e229ccf13/15429142142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=can+you+burn+pine+logs+in+fireplacePDF 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_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 18012 bytes
SHA-256: 490d066a293b45cd28b9079c7d2d3d3fec300a95595b984c94887bdf04be45fa
font_02_sfnt_off00013d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4B 10944 bytes
SHA-256: 54db82d02845314187eda158a7fe03fb075d0c917943bf5fde95d5a2c6d9dc1f