Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ce98af952b50f7…

MALICIOUS

PDF

83.7 KB Created: 2021-10-07 23:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7dc57ab81fd5b83e62f619f78d5af25b SHA-1: 3bee01a9f00a70e3b9073c2888adb7ef58fc49ee SHA-256: d9ce98af952b50f7182e21ec699145ba18a865e850d7fda5e22a2a2d9bd7d6b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, many of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous unknown URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/nq7dofhoo694oq3k6cne0bbujr/tifexuzepezaf.pdf In PDF document text
    • http://ahnil.com/userData/board/file/zosomomunozowuv.pdfIn PDF document text
    • https://slotpt2.com/contents/files/biwudilefokejubotilapeko.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/47277932785.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/53031969304.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/77226678207.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/75901210058.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/77637234489.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/xumuwulozidafon.pdfIn PDF document text
    • https://pratham.one/file/53471566460.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/xutinutobi.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/96261318885.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/videkotewo.pdfIn PDF document text
    • http://www.moulbaix.be/fck/file/579047340.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161594a832fa94---85160582223.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/76292820979.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142645122599---81072196679.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/sadagek.pdfIn PDF document text
    • https://506hlapeta.com/files/file/48158138610.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/41608777214.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/63756198918.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615594bbdc057---rawela.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6134a7c3c401a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+happens+at+the+end+of+the+landladyPDF 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_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 10508 bytes
SHA-256: 96c0e23b7481584e3a1054d19d33d702fa0d939a96d53cef3b7af4c96c06eae4
font_01_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 17844 bytes
SHA-256: fb52e123a3bbc618b47c55a894055716ecb9c84f9e43d8dfe7f004ab2fe27486