Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6446e5253a78b9e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 02:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38851f9042871fac5851f0fa38cfe601 SHA-1: 1ab15195f90b81977b9c05e98e4a69efd2b019a6 SHA-256: f6446e5253a78b9e596d88af7f5dcf435f295bcf3c364b2680648d82c0de226f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The embedded URLs, such as https://coretry.ru/uplcv?utm_term=empires+and+puzzles+ios+to+android, are likely part of this distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://coretry.ru/uplcv?utm_term=empires+and+puzzles+ios+to+android PDF link annotation
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afabd8c119---budejekexa.pdfIn PDF document text
    • http://atek-ent.com/upload/file/84019341432.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/gudefis.pdfIn PDF document text
    • https://bem-sa.com/img/file/romukerazi.pdfIn PDF document text
    • https://tcremich.lu/files/files/dupetipomosefi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sesibir.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/rimajufenabasovimarakedib.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/97085687474.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/tuparapiv.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2b1680bfc---41330652103.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jamoburisirume.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/mixok.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/6635665440.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/vikunuwinawi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a401aac6e9---15545144213.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3702509b3---82219054855.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/sifoviteluzowoz.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/86161524437.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908042914763264.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210908045807197197.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/xomokopasibuxowinod.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/gapifemeviwugevusatekewo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613180e860bce---keduxuburavesamagi.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_off0000aed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED8 15608 bytes
SHA-256: a745b3604e061ecd84c4837821b4c269efc0ad42133fcc227358d02c60c1aae3
font_01_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 10696 bytes
SHA-256: 3184b3fd6b5173070d88daec226c3004afbc6c52ad751fddb2ac20373eb96b5a
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.