Malicious PDF — malware analysis report

Static analysis result for SHA-256 757e6dfb38361939…

MALICIOUS

PDF

71.0 KB Created: 2021-09-13 06:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7908b10b9877199c24372ad30a83a55 SHA-1: 353118cf2f83050cc3ce3147d010114eef8debfb SHA-256: 757e6dfb383619395f9c71ef1a72e2e1522091163afc2a0a66dc0627ce494361
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ip-golubev.ru/ckfinder/userfiles/files/pafuvonulono.pdf In PDF document text
    • https://bfull.ru/uploads/files/60414190352.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6t27lu9jg8np6cshv1onjtqner/97313652102.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/93f5bff6ea43835c957d47c8e8bf76c4/zawix.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/lixur.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3e4571537---82431829932.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/88256349093.pdfIn PDF document text
    • https://mavibusiness.it/file/tufaxamexifevo.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1433517112613b3f152fdd8.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccae882dc0---26137987233.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/dubiwexanesoguwuw.pdfIn PDF document text
    • http://tochalco.com/uploads/files/padorukupelap.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/2388388994.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/xizivop.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/mowob.pdfIn PDF document text
    • http://hla.vn/upload/files/63118765534.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/sexowedi.pdfIn PDF document text
    • http://tulga.ru/editor/files/88633782795.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/serobavipazev.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/29193398553.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/zapurajutonalezuruze.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9082d1a75b46cee61ee84e390b84e2ff/80750606728.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o92va9if97te4o8nre4rm90002/9035401170.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77541427666.pdfIn PDF document text
    • http://soc-in.com/data/media/files/32533816947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=on+turning+eighty+henry+millerPDF 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_off0000b533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB533 16208 bytes
SHA-256: b83859c744cd2fc67d1ac39ae725ad00d3a69768d6408f729f7af6be28b96dc0
font_01_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 10344 bytes
SHA-256: 321233d423f2b7f3d5eed38be4baf99de2781bc039d0503342e4f11514bd1e42
font_02_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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