Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae296537cd0f444…

MALICIOUS

PDF

104.5 KB Created: 2021-10-16 08:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f58daf8c7b16aa4f5147381f1aad5d2 SHA-1: e6bd54cc253a026325e980b0e60081b54e11fa82 SHA-256: fae296537cd0f444b70dc8ceb2a343b62b91d09677c467d48b5e89a51e42b904
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://acrgruppe.de/userfiles/file/penagubatub.pdf In PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/maponolukogeme.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/gagofufobumanabo.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/195692840.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/jemufiwurosu.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/6304570360.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/tamabofowularoxo.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/wikuwugabamekini.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614402a85f6df---59031757013.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5546e50978a4f8aadde080759b341521/34141782394.pdfIn PDF document text
    • http://premo.at/userfiles/file/tukezivavenimolusuxu.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/5607958719.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/34367001973.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20211008011650.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/rugazopetijarusa.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/62495098507.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/nedutove.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/46560955613.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a409bf19---7820636231.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/81332066751.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/pogiva.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/31193643651.pdfIn PDF document text
    • http://okun.su/upload/file/fedezexigilipanileja.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=how+to+get+max+money+cayo+pericoPDF 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_off0001354b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 17628 bytes
SHA-256: c8746fb848211430299113872a8f64642e2c1000be4cf83febfdedb8b73b6c55
font_01_sfnt_off00016296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16296 10796 bytes
SHA-256: 41e1dd06309b1fcb564eb01ef1109ecbdbae90f1a3a7b0ffe5f26e21e5fbe920
font_02_sfnt_off00017b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1