Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6924f7a8045b6e…

MALICIOUS

PDF

95.7 KB Created: 2021-08-03 02:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df563308650175da9b78eebc859b2198 SHA-1: f2e73ed3186d964be1d1a80d477ec718c02a7251 SHA-256: 3f6924f7a8045b6ec0484bb9864890d0ef8dbca64d7b8b67c7832b71dc4e8529
156 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. The document body is heavily obfuscated, but the overall structure and URL analysis suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff40486fe---putituwufuwemokesid.pdf In PDF document text
    • https://orangcar.com/app/webroot/upload/files/61593135794.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/gokokuvelubugixedubape.pdfIn PDF document text
    • http://techbis.pl/files/file/vutajalixazox.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/sutavepel.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f84c52f8b---34778823208.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/22585583216.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b6d5e3f1---defumexarevu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/jipaxurovivesona.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sipitikuti.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/s68qg5dll9err3lno3jnadbtst/duxadarimikomebefometina.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/30557960185.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/mamegaroxazuk.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/88004043025.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9c65848f3ebf3c2ecf7376540735175c/vamurojelofikibutosogurod.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/q7s038k45mb5rgo61n9pqmaoh2/vewasemezemozarum.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/57f440353dbd2813e03077c67d716055/fefaxuwusas.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/47506372810.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/kewujegaloso.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hhe81mflplful8vu0qs0fdaqml/95500832198.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/puxuxupezuzanapisugimiw.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0vp4cjep5i87djrovijsuh4jk1/94862383237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=libro+negro+de+autos+2019+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8a4d79c3f25c906cf55fbbaf649ae5c1/4292181877.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_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 11284 bytes
SHA-256: 09b6ec7a2b44234ca15bc15cc73cf589d3b5d45fb344293cca900c824f2dbc96
font_01_sfnt_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE1 18936 bytes
SHA-256: 5a3950453aa0c1f5fbefcd0649acd80572ae72e7aa2f76b1f744d64b708c49df

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