Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb920356f1ff9eb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 11:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1ae073bb564c8d59133b490c9de5a0b SHA-1: 9260f19d7d98eccba5e147267efbd61c9ee9ca0d SHA-256: 3eb920356f1ff9eb147f8f124861202b5645d0f8d3cc9ea94ad31d30c49d8f08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the heuristics indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16080f59143a0f---fugizej.pdf In PDF document text
    • http://xedaptap.net/userfiles/file/tudixebenipem.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/440cc66567772bb79e371fc62a44c505/94313054423.pdfIn PDF document text
    • http://4rrecycle.com/files/file/donowolezaditotagiranej.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/gevarakewuvuz.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/tomosafawulowumojosemazi.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/murujoronudifunabeti.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/50023024876.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ccb674d049deb13a576a799ba3f85a7b/78771581865.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094683bdbc69---kapesuro.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/lugeperez.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/pawemutorazuvil.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/bebikiverako.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4c59da74cba96a6964ef65eeee5ba657/3231832733.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9d40b86748bb823b14f2448e87de27df/baxikatupun.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0fc6902e9---sijazavofi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/618441cc48d8b10a02e0c51ddb51460b/vijegedoxuv.pdfIn PDF document text
    • https://suncables.co/images/file/68458916958.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c1c230cc0ccb5a7afa7c5cd5cd06b98e/35069252503.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/15d1f88806bc5a41dd1c487948060849/vusiwes.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/74616039650.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0cd5gg2dprmvfbmjonicl0j7mp/volewokuvunorodomur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=converter+arquivo+pdf+imagem+em+textoPDF 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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 11072 bytes
SHA-256: fbda45815a47f5a5408d2faba5772264bdc09d4e9c65f9927b8c293a8d9c85d3
font_02_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 17756 bytes
SHA-256: 8cac8bff2d8617159c15fa3f31db887e1e4a570d79f471c7907dde355022d2fe

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