Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7f9551137c0b00…

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 03:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7be62c10fe45a22c9052e5b41f8c57e9 SHA-1: 8a03a153b466e8f03fe3d7a3fbbf6a27a2915e27 SHA-256: 1c7f9551137c0b0064c073a79c88400b78437d4dcb71bf35d5d9f5668b1cf2dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://kryotherapie.net/neu/userfiles/file/gefotegoxurawekolamubiv.pdf In PDF document text
    • http://traiteur-ribot.fr/userfiles/file/59442704131.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/3v9fdgh32ccjfnos1c9vdqqo18/buxovusodimefavudanoleziv.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/3285074745.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3b8d73ecff9f830c0a0a7673a4fb8344/fokapumugoxovetugafisurip.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/fafomafefejavatuxewawusoz.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a6b45ab9e3378ca9172232609bba011c/46954298786.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/vesoxukewejoxap.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/593fb0b53c403bd1c08a4802d6da841c/bunutozul.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/3sheu5rlqg6bmr5i29ua0shutv/kusolixebuvubumiluvofu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9ad6227e4b9c7e2fbf6effd6af3fa832/14430001680.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/m8arr7ih9olbo2lcpopb5am5g6/87423008473.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/bifadivivoreniwokevax.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a38f464fc3---dudigowi.pdfIn PDF document text
    • https://ka-base.no/images_content/file/39304978976.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0d7ad74898c7ad5910c5e19d68b79dff/viriluwegudutomelajo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/27cf2c2d778d82af054d1c2f90717e8c/7799814010.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/zabusuvulid.pdfIn PDF document text
    • https://inifd.london/uploads/file/gipaxevoluloga.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/gojojusamukominufip.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a052e97ad80---19026698230.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210614125943_u2p8as.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160718bf032c01---bulolumo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cecef1dd68---vunudurozavijo.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/62931449540.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae06dc022a---padelawurifotesaxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=soul+of+might+craftingPDF 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_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 16780 bytes
SHA-256: afca3caa6b25c5e33d917bbb5de5622ba062424290014139dcce81aefa8a4f9e
font_01_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0A 10660 bytes
SHA-256: 5e4acfbddb39a2b6f17cc0f62e5563e74b9d62125e6f1d867b8be1fcd02c4ab2