Malicious PDF — malware analysis report

Static analysis result for SHA-256 516cebfac0561304…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 08:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcb9f248cbe87a3b79ecad4cfc796324 SHA-1: b91c83f2962f92b2c99ecf6bb41d16cde8d7a201 SHA-256: 516cebfac0561304653e4a367453daaa348f4982533a77f99237fd857d4c6f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548a62816b---karuregiraken.pdf In PDF document text
    • http://dj-maily.com/uploads/pages/files/jejitiwesik.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/88384538873.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/54044196333.pdfIn PDF document text
    • https://dalba.net/other_files/File/topusig.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/panuwadoxadibajovapofar.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/91694290153.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/fivevipejajijizoregide.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/fokukawalatejuwega.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/takawig.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/vutotexefirobuji.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/tekog.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zowiwosobasivebadoruso.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/444eb9bd71df442ac3d167fb1d689199/78750808481.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/pomumejifozabuvebapub.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613031f431935---kuwidebazezutenerifil.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/93277066952.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/89437909389.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0b8c5d3a760d1765df2abc0a651b223d/56141731944.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109041301062379.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ca06c13c08d6a35885e7486b8a15d0f7/logalasalofo.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/49689903534.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/danewebukinibemitifarabo.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/fitatagasejepep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=shadow+fight+2+ios+hack+unlimited+money+and+gemsPDF 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_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 11412 bytes
SHA-256: 44c276275bcbae6792cb1166650ebef484533b8e18f650df32aa710ab1e82d9b
font_02_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 18432 bytes
SHA-256: cd12889a8b31c0fdf943da32a98112fd4718076ab80c17585a90742bbbbf639d