Malicious PDF — malware analysis report

Static analysis result for SHA-256 d406677bf8227946…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 03:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1628b04722531aa70f88ba2b51b21dde SHA-1: c7a56d607df393e3e740a67c5e27b5d4ce20a017 SHA-256: d406677bf8227946fdc99c89478b45876a1821221d4e0c7f1eda469dbd463b83
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the heuristics identified a link farm on disposable hosting and compromised CMS uploads, reinforcing the malicious intent. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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://centromedicoveterinarioadda.com/userfiles/files/87802593998.pdf In PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13c1f34fc---77523556345.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2418d5d3d---29337770406.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088088947bcc---88271471944.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fde5e6aebfd---24098892105.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcace55cdec---61465112761.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb4c352ac---98841718999.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/tijok.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/26120332459.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/naxawozikujuwapis.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiwigideguju.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077968ea13e1---26161971220.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/55896293073.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/51598146465.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7d1aac83---31914027738.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/kazaja.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/350e1c0231d8cb2b1bda56a7026b2617/xaduronodazozerob.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/17358220157.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xoworowutavujipiv.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/reralir.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/natafuxisamoz.pdfIn PDF document text
    • http://heureka-cz.eu/files/xerib.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/86480432674.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/923ba2f3dbebe4c1985bec74ecc8de89/97966137885.pdfIn PDF document text
    • http://talleresjpg.es/img/file/10949341559.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/vovubar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=qualitative+and+quantitative+techniques+of+forecasting+pdfPDF 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_off0000bafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFA 11268 bytes
SHA-256: ee4844cde00f30042d208dae3e392572a0d4003fb09d6f4c6e9e9ee41429e938
font_01_sfnt_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 15068 bytes
SHA-256: 03968747417e50dcbba9f5cec632ce4a0d979154b33424cf3e52b4d9cdc6c15c
font_02_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1