Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac4d21d29919afe…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 08:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d21c4a5175df7f7e910f0f015223d1f0 SHA-1: 985e8cffd27a05e61c8f1bbb267e711dbf0df507 SHA-256: 0ac4d21d29919afec89eec0c8d18758e6b85cdc3399b9ee244234f4dff73ffad
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=star+wars+knights+of+the+old+republic+class+guide PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386d7092097---24351052109.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/lazasomega.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/23072918697.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090615143488.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/78607929253.pdfIn PDF document text
    • https://edusfera.pl/upload/file/19939475837.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/77534493095.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/xatapadepumazili.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/wuxazozabokisukita.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/ruvas.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/nuzag.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/4222141855.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/pisop.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/18464206521.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/36825248684.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n13rg58ehvj0doalkt7jogthk5/44038078028.pdfIn PDF document text
    • http://livestocktool.com/d/files/26912655745.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/63889773910.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135d253aea78---30145169198.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/38909015734.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136679537b99---viresibijud.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/kurugenegovosaledijikoke.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/dazarabizumigikeka.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/salimafefipewe.pdfIn PDF document text
    • 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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 18192 bytes
SHA-256: bd0aafea9dd954f093bb032373222d5698bac8670e1925cacbf3b2ae0c74d071
font_02_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 11392 bytes
SHA-256: bb82325842eea8b0bb5ab418cae1f5edc49d84ba9d1528b328589bac3098ff8a