Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff8a886b573f629…

MALICIOUS

PDF

93.8 KB Created: 2021-07-05 05:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7eb7153f0681677bb52b1e36014291f5 SHA-1: f2bcb0ad2a664130101b5fce2a57f254d40b9ec1 SHA-256: 3ff8a886b573f6291c0e0497ee0c79adad9b27b4622496e96c6e1a47502ca9ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/votikevexulibaligan.pdf In PDF document text
    • http://dspec-car.com/js/upload/files/fanalujeredero.pdfIn PDF document text
    • http://aven.su/userfiles/file/51229117460.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd9b07540---13359395249.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af7eca095---35986246251.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sp6ii1hnuqdo41s8ea38buaobv/waxukonanegofa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f936d9a6---63795419638.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/nifujarinuzefebufijalake.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2515f1a6b8103af97bc71183b1688a3d/97195686954.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a131f3cdc0e---bosewubiranolupizezolefux.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9cab85d192da7f2402baffc031ddfa32/niripanipejefadelowujon.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/7817112472.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c91e6cc5a72d38ad3e29d152ed4dfbc9/37310076231.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/as52v020jcd5v0ar1scdl6gsn5/libudixazelabaguxup.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/pajuxoxigus.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/rfcv8b1ltckmo2i9v6pnn7itq7/64828002754.pdfIn PDF document text
    • https://airshow-bg.com/file/31061751382.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nbkom29bnf8237pnee3pdntee3/12834022136.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/ruxaj.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/17887460127.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ks785ig82b56tcfa4lagoorvt4/35119310628.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021527222914381.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/dabezewibapaxurutokewa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4536f7b1---babodesepe.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/nezovibuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+save+a+pdf+file+in+excel+sheetPDF 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_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 10860 bytes
SHA-256: d3bc65ba9ea3e429bdb39b8fbefb37f7c135e820f55153a3306bab49c9e1ad3f
font_01_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 18716 bytes
SHA-256: e9e2a80dd07539cbcb25d17b65f601415b1acea2a600d42f8207287474138b05
font_02_sfnt_off00015195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1