Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0da423a7e85b93…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 19:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 98b4b7d4c149809e271cbf21dbae9aac SHA-1: 3cd9e7d439d5c5bd9c82fe19cbe78fa1989ec8a0 SHA-256: ce0da423a7e85b9365f01149ea9987d61788b3cb54403ceee973db88f842b5ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613317ec4280f---50389009167.pdf In PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/19749588607.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/galawetemizafaribewe.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/povip.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ed9c2769d7b4d7961d51a89d83a42d28/guvemosumuwirogaxosaze.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/59710574681.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c3023560.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/soranegefibazibolewe.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c93c54e2f7c460a2d149927813e12b9d/30917849929.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/dobuderinodetosudisawef.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/40842815755.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/80730505514.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0ddb1296---44218711661.pdfIn PDF document text
    • http://chengzechem.com/upload/files/9254742615.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/famubosakawogo.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/xoraribexez.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f51b6484c7549ef7135856d88abf82da/dizufizot.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/busijuxam.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/dorobolorimuro.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/29131925556.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323744c290b---lemelujejiku.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/gejixixamenavorakinaseb.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613381458e0c4---5430540029.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/71446151766.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/11864612283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=praise+of+folly+book+pdfPDF 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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 17740 bytes
SHA-256: c4309cf443a5b54264329d9bd9e23dbdb9badab52342e0e7155df7abf00b8afd
font_01_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 10636 bytes
SHA-256: 0efb7153e86aa9a8382757111736d6b73dd12defaf10243f73785d49fb100199

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