Malicious PDF — malware analysis report

Static analysis result for SHA-256 babf3c4b03dedb54…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 17:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 600a8987f52436343714dfc4718c417c SHA-1: e91ca674fb2922296d754f41f55a7276f4ddb42c SHA-256: babf3c4b03dedb5444484c220e92697e202dbed828e037396caf7eaf3375c7c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting vulnerabilities or delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614149ca7f8a5---suvix.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f196a28d68---59575890579.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/34149856690.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/femuxukebodifitep.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02c54cc4d---67777364399.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/17413525449.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/36493257101.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/76995679581.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/14368360254.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/witulakipodefajuf.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/tobozulegawupinegonoma.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/finelipugozadomazogud.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/vomesugevogefemikozomel.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/xudinaf.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371ba1d5d6d---96409419864.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/ziwazasow.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rirufivuxinani.pdfIn PDF document text
    • http://gewald.ru/content/Files/sutirafigekukadapamo.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/12136350925.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/49412635208.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/91584265488.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/gefanobijew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+swf+game+playerPDF 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_off0000b650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 10924 bytes
SHA-256: a0a44bf783a8e4dc07d1ac362c85e0116c810c1b952c98b66f7e06e113f405bd
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 15724 bytes
SHA-256: cc5a63712da7b590f9f2ec67d75937b243f0dff831c44147d8f7f7a1bb1a54bc

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