Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cefa368a340ee2…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 08:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8470aad0dbc6d624154c8008397f867b SHA-1: efac49c8eb8461ff9a7bcaad90c3b9c37bace018 SHA-256: 19cefa368a340ee2db848bcbbc6d8c30f580a87b194f1eb6681d275ff06a5d04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, directing users to various external URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, potentially for credential harvesting or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614492bd6b193---14783852228.pdf In PDF document text
    • http://sxnqx.org/upload/file/Fl202109162100432848.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/72775058836.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/lipamuwugoj.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/sitifexerujuz.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614018e75451c---59828392630.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/wosurowapakizutibutosu.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/87782178853.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/wuxuvupejavipawurezit.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/15523098681.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/retasoloz.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/67654846391.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090500183391.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210907220942.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/vojeza.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/mewidanidewe.pdfIn PDF document text
    • http://kustari.net/userfiles/file/pulopa.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/91850098471.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109111716209687.pdfIn PDF document text
    • https://longhoang.vn/upload/files/befukuke.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/sijetit.pdfIn PDF document text
    • https://rafautama.com/uploads/file/6248918748.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d4fbf9d9---57019367092.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/bowotelixudine.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/68722720529.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/sojajezefibonusajuromo.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/24180423572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=movie+corn+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_off0000c013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 10204 bytes
SHA-256: 1d2cd166de5172ee0ec256164192bf985e1dd2f283e908bf0baa8500478a44cd
font_02_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 15984 bytes
SHA-256: 1fbf54c83067c44be115b66695841def7983631e53af51c3c1e3a7f4b28a585b

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