Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6fbb4512458369…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 22:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f99a9066765e8f7760a86e24021da45f SHA-1: 0311a6f8654cec4e374d9e252bf1f70238f7d6c6 SHA-256: ed6fbb45124583693a5ec5b2ffb63155ab1c43094dd01d0923809d95eeae46ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/13475682616.pdf In PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/gigelodimozuwok.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/39459102557.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/27108335260.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/98495120602.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/niwemupozapowirelesafivuf.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/70501719682.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/64385817115.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/lufekiro.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/domezejepamefefomipokixeb.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f46297fe8ecc4a794201a184c3efa26b/93073774250.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/32479178869.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/31896276611.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ca91436f---lolavasuvifadujexux.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/rofinetenosiworaz.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f8ea0d2f---52624253435.pdfIn PDF document text
    • https://mauspro.net/upload/files/10019322009.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/72469721759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sword+of+ditto+apkPDF 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_off0000c54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54B 10292 bytes
SHA-256: 5f314512fd703e0e03287488f37bd60db72c7e1fd0fed245904d641a9883f9a1
font_01_sfnt_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 20188 bytes
SHA-256: 27e1641af646b3c00faa8a4677ba10ef0276a49ff0fe09c819b9c1e9ff5c332c
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1