Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0816a0d7c6c9ab7…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 19:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d964a62dac0e08e72863b03c88c4c2a2 SHA-1: fb452d010e51e5a7ab53a83b56f98ccd3f391547 SHA-256: b0816a0d7c6c9ab75472911c2de9620b4108865b4e2f081a512da512a3ecab82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to trick users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=mortal+kombat+11+ppsspp+android PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413fa064189---71362687132.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/rozavekawuba.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/12142137904.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/nofagujijitasazif.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/nojowomimazopidano.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/84089823940.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/42534626417.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/sisalidemizi.pdfIn PDF document text
    • http://superazs.ru/images/news/file/xapikujos.pdfIn PDF document text
    • http://drtamerturan.com/file/wefosakevatik.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/ramasipememotafi.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/devan.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/26545982245.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613166b1981f5---84025082896.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/jigilavumagusiralubifefun.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/73835126839.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/29223684372.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/rewiwikuwababid.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/motak.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/82918039127.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/36900510660.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/pivaluriwofopav.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e081db5b58848b95990bfccdb941e4be/13142310752.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_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 10696 bytes
SHA-256: 25dd497ae6cc0f25b6055dd21bd8135eafb33e7fbf8cd6bb7bae4e568f740495
font_02_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 16932 bytes
SHA-256: 58c3b824d9ea2288d2e179f8001fc0196b834716d3eab668633271fe412580b5

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