Malicious PDF — malware analysis report

Static analysis result for SHA-256 644bf23ca0825a6b…

MALICIOUS

PDF

90.2 KB Created: 2021-09-10 10:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59484c5e28ee3ea78996ddd181b84b5b SHA-1: 2ee4e09d8bccf86427e1219c289189f70ba331eb SHA-256: 644bf23ca0825a6b12766a098ee2252e28bcf4d42495a7349e3f396ea3860dd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to host phishing content or redirect to malware. The embedded JavaScript, though not fully analyzed here, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 http://rszm88.com/upfolder/e/files/20210906150454.pdf In PDF document text
    • http://boek.se/bilder_umeny/File/97747843192.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/26297351002.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/jaxatovuxukuf.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/vedegimosudo.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lunisamulabawopupa.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/gilabujuzofulupafufegisug.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/34506620370.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/35089397423.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8655b3013c5172ad4749d1813530e5c2/motajovureboneputeb.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/rufosoje.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/ragujadomawupubo.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/15416163796.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22696251932.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6e50fc9ba9188fcbc9aea53547c68658/vipizokekevixeporo.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/15467521235.pdfIn PDF document text
    • http://onelove.cz/file/dokitadezakalojarepaj.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rhvuu1m3i21tkeqa5rs6d9f3ms/jawuretexaz.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/27478259134.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/43283927023.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135e50ca346d---70285866945.pdfIn PDF document text
    • https://31app.com/userfiles/file/50829648107.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/43226586589.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/47322041182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=migliore+app+per+pulire+smartphone+androidPDF 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_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 17464 bytes
SHA-256: 09b35d186bf5fcbf8cc8ea3166cc407dc2f5eb5d5c75ac263c09fa239311e2b5
font_01_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BE 10932 bytes
SHA-256: 13069aa4d78a1ca931fe54ae5a9f5e75042816bb876d0f6ce4eacdd4a6566e7c

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