Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed8e01cce8d4186…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 14:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 234c378065bd46dddcdd9d7eedde2555 SHA-1: f18e8613ed5151db8d345a32f54bd7c6436002c3 SHA-256: 6ed8e01cce8d41869fc0f321dce407ad7f0a9b51754e87598f35dd6d1734c823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://oniceh.ru/uplcv?utm_term=best+drawing+apps+for+galaxy+tab+s6 PDF link annotation
    • http://www.koeru.eu/failid/file/niliditope.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/godemil.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/fogaboxoremepanipogure.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/78246201280.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/85355408397.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210910071020.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/20948831524.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/dalofuxidatomelisixasufo.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/88332369102.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/79086554330.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b8fbef42---59058120236.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kikemewekinotunabodibux.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/86798828681.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/tafoxorefisolotona.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/16c7a083a1b2479b325365483517d8ce/37804294952.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/92720503124.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/99467482274.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/69882790133.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zixivevipijobaseguw.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161520429263fd---80106034269.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/54004397182.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/72980736759.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_off0000ace2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE2 15412 bytes
SHA-256: d23d3010793d9b6c6bc028d1176dafacaca4bb37486129bf0d97473034c7ad40
font_01_sfnt_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 11336 bytes
SHA-256: 4db252492679f79a6cd71861b2fe78e5c3c910f332d00713845b9b2e86fd535c