Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb6cb2cb64da1ec…

MALICIOUS

PDF

74.1 KB Created: 2021-09-12 22:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e6d7069277332a1c6436fa3fa5462899 SHA-1: 853788293bae99256a68ed143c6577d02b234c0e SHA-256: 9bb6cb2cb64da1ecca8bedca8d3a5a6e556d451d0eb05a8c9a3af31607006562
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. The PDF contains numerous links to external websites, some hosted on compromised CMS platforms, suggesting a phishing or malware distribution lure. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/87995585300.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/zegirazekuvigub.pdfIn PDF document text
    • http://riversedgefm.com/files/file/66666721970.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/75485618425.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/feremefo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cdcd5ae20813dbf0df51eeda21554036/jazejewaxalagikeli.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109030223591334.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/99846606092.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/95b5b7c9893fba2930448312a2f52a88/xovuvenaretuno.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/5099361508.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090512091773499.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/gunamiw.pdfIn PDF document text
    • http://hasyo.net/files/file/46833361813.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/lafuxurunuxubigep.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/vagarefanuwezabud.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613070ea83f1e---mudazasanowozevovagofeg.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/96836568996.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c49od2qqbcv2cjis331qlcdoh1/texapuvenom.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/67757494220.pdfIn PDF document text
    • https://el-tall.pl/pics/file/gevux.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/22697681894.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/jewukitaduf.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/xorasosevetawujefalamel.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bugowebed.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613978a64a2a5---zawiwuloxatoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+pes+2015+for+ppssppPDF 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_off0000bc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 10816 bytes
SHA-256: fdad24cb6ec9ef969b3031d4bbcbc7119aee6a892614e87830baba4dbbe28d67
font_02_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 17452 bytes
SHA-256: 7d424c79dd9ccd09eb55d0c01d5cb5311a97c5fce371488af6fbd324f616aba1

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