Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f94a6724aea518…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 01:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6913be09a999528a6a6eb8cfc15b636 SHA-1: 722a6034ea36b843427364ca5de0c6694646f63b SHA-256: 66f94a6724aea5181bb3657da40cfb05d5522343115a8736e8bc78f4d06d7867
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites, suggesting it is designed to lure users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or delivering a second-stage payload. The document impersonates a cloud service, a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://wastran.ru/uplcv?utm_term=how+to+make+an+app+apk+file PDF link annotation
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7aadc8f56b82de79668043ff6a8f1b3b/68935383003.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/jejusuzuzopewum.pdfIn PDF document text
    • https://viettrungson.com/media/Files/vewawukirafuwe.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/rebitebixuganer.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/36258464317.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/fokog.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/loxenusenulojizif.pdfIn PDF document text
    • https://negaratoto.com/contents/files/67540204086.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/fililajesituvibuwi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614654a93db6a---luxuz.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/69617495710.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/7676088175.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/96582942520.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/91011008742.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/18047757489.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6a090ccd2e9a610f4a8c35c61a632ddb/38027767618.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91baad6de---zusilexosetomelubudujuk.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///37470166619.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/fitupagoluserixosapo.pdfIn PDF document text
    • http://starma.pl/files/file/dukifanudupebi.pdfIn PDF document text
    • http://kammed.com/userfiles/file/julamoz.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea88a2a0ab---fenopisowumunupaju.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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 17048 bytes
SHA-256: 29d5f05f2497d8363fc4aa64cd4bdb8501c5b687ca6e9a0225ffe00082b969f5
font_01_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 10420 bytes
SHA-256: 5c727676f26c407cca2d13e437bc91a907e6be9c8c78196bd45a7e1f137c98a2

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