Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce3d260090cddb8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 15:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f1f2295fce865cfb1c4d3dcba81c453 SHA-1: d188a10b055a239272ae936765d7382679c76368 SHA-256: 8ce3d260090cddb8d566acd736895394de92f741d6fcd7a3d78fe7d5c2d76b74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to external PDF files hosted on various domains, some of which are identified as compromised CMS uploads. This suggests an attempt to lure users to malicious content or download further stages of an attack. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dom4m.de/userfiles/files/99558960912.pdf In PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuziw.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/tatadirelomogode.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/73415481260.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147c820aa34f---negapazozifuv.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/fijegebatad.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/nokebabimaremarotewu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7dcc62971---rafepaxune.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/modadi.pdfIn PDF document text
    • https://finliz.lt/i/File/74596031056.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/85749155851.pdfIn PDF document text
    • http://generaldistco.com/images/file/87338312041.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/zusuron.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/20807030847.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/11o3h2qkj7m7m2q5caaea8vqgj/zazekopaboseboruzuw.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/motizoguku.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/levofe.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/winugodewi.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/zimeteke.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16148c60a9b8ee---61481508938.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/40746732281.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/gubutosijadeloki.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/9934829079.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613109afd701c---72476870733.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/ligojumukulana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=beauty+idol+fashion+queen+mod+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_off0000b6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F7 16700 bytes
SHA-256: 88a1ced5cca9f267eecc49ce503cc2691ccc07515862591affede6fd3cf92b08
font_01_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 11168 bytes
SHA-256: fa35e277fcd4b4fdcf45354c149f5f69837bbba74870afbb4be1d2a1b79d48e3
font_02_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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