Malicious PDF — malware analysis report

Static analysis result for SHA-256 1561e5f718ad17fb…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 00:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c444868537e27eb6ce56c0c06a79a93e SHA-1: 6b945e9cff2900c36446a932ab97c24c7a9046cf SHA-256: 1561e5f718ad17fb9bcd8a652dee034262455afe307e0d97a83cb9dfc3264cf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://gaadalagi.com/contents/files/68278476144.pdf In PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/sonevilolikux.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/lusonuzulugaxomiwukutegu.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/5582117903.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/78343477867.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/jefiwovi.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/vuromobonakib.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210909/file/1631161275.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133345336431---zutaru.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614653ff01ee3---vizulefimivebifod.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/fesinen.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614389328f8e6---luxavitove.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109160959479496.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/32727240161.pdfIn PDF document text
    • https://combrooncom.com/contents/files/39259194289.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c60ca0026b---vepitoguni.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/rimixatedijijajonati.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/35676458400.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/56553038730.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/015fa3a89d1ced4a30c8b6bffcf63517/41237763724.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/70711265271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+version+to+api+levelPDF 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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 17500 bytes
SHA-256: c046e74b25e04e1fc64c54bbcd8cd0aec1a3c6f081d90be1b35ef77edae1bcc6
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10432 bytes
SHA-256: dfd55365a323d667f04c960c1de1b0af3d79f49b9f7b64c5aabcd8ae132d8f9b

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