Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e23cad96d3fc037…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 06:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7a4893d2946a44cfde6f34bc6c7e6e9 SHA-1: 89f434e3d6959ec1b52d669e76948c043afdfe97 SHA-256: 9e23cad96d3fc0371fb16c2a99ddcb8b2f90858a0a5410b5fbe81ce7e187802e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or directly execute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://irlanc.ru/uplcv?utm_term=oet+free+reading+sample+test PDF link annotation
    • http://baugeraeteverleih.de/benutzerdateien/jezonosogupurasetopabife.pdfIn PDF document text
    • https://2acontractor.it/images/file/neranebovivogo.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/livebekubezizixaluzaj.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/91897798653.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b909414b9b---70604785851.pdfIn PDF document text
    • http://video-cycling.de/files/file/godolezunupisakot.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/efaacee0d7ae2fa01d4555c8b93a5ffe.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/74032624171.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/85357015847.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/11068362845.pdfIn PDF document text
    • http://all-premium.com/user_file/files/47938459755.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/zapalafuritadedo.pdfIn PDF document text
    • https://actor-conseil.com/files/file/23983122957.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/57287488323.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/51186903272.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/30060946850.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/ramidufezipipo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336a0ac5e24---98669062342.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613037066c152---bunigivitusev.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/7413754965.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf17f301d---3661668046.pdfIn PDF document text
    • http://webs123.com/userfiles/file/68472443080.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/demamitirevisamo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/supisakizowosefugaf.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/kidolepaj.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137df578569b---23352178911.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_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 10748 bytes
SHA-256: e827a1233c57f5c12660a375e19dd45a3e8cd80ce4deef071f6a9ea684b64df8
font_01_sfnt_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 18288 bytes
SHA-256: fab565b06654e3fe79e76c374dfd52f46846bf07038af382e6d12b28244c27bf

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