Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf3a6a95d65225a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 23:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00598aa8e480bc93e5d0d7b86be536a7 SHA-1: 99b78cc8296365593d5a350f4166110168898e07 SHA-256: 2bf3a6a95d65225aa7ef1d9741e61e6af6c85095f39ffd41767275618e3a9f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://synerhu.ru/uplcv?utm_term=mad+max+game+for+android PDF link annotation
    • http://gramercygrand.ru/files/file/walirirokatovurewiborigu.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/37933041423.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/97977506813.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/9784365801.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/xutoxexavol.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/disezoremi.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/pusuwomafojiziteruz.pdfIn PDF document text
    • https://kameramuzesi.com/upload/files/12110421126.pdfIn PDF document text
    • http://grupophi.es/uploads/files/turetimoruvugisora.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152dccb0dda9---76124730169.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/selufobulek.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/8438153131.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4a0928820---81932950244.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/wafapupoz.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/xemikejelo.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/43351721093.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/31924411880.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/fujizopekulutupi.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/pojesa.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/76508241368.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/10202826634.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/94864342010.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ea2058eb9---puledupanoj.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/lomijomazodukax.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/77238990256.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/natirojamovolukewiz.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/88754618962.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_off0000b6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C2 10480 bytes
SHA-256: c826a59aa4b5ab67e4f3a75f5327e0798947a1f288ef12ab19c20393a5cb98a3
font_01_sfnt_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 16216 bytes
SHA-256: e71c1adf182ea4bf3f1f9514c2848b76bbb78e5c6366ebf744a50b9db583b8db

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