Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4878937068fb30…

MALICIOUS

PDF

97.2 KB Created: 2021-09-03 09:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4be21e49f4cf88de0b59cd4e96b8ede8 SHA-1: 4375c4031b924c2f4714808a0a70ae9e5dcae222 SHA-256: ca4878937068fb302c8e149ee5155cd1134d59dd8115f45fa010299fd5acf24d
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 CMS platforms or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/o24u27tmpt58n7ef1cak0cn5lk/lebimakitojetapizatej.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/64217466951.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/65497909747.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c8dc85bf55aa3202fe3d73ec3f89b778/pogimabokox.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7dd74445ba9d72ed6a60c15a6e229258/kawuzobisumota.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/2942230643.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/43358506818.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607108c8e6729---31157273726.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf2e49326a---96739719119.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/rewewilarapapukan.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/59432553404.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/lidaxifijosafig.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607053b4306ff---22629893287.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/36245761954.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/rojazujusufagajix.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a728abafb51---7929820766.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/2366335181.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0000b7cb65ea5c584ad0307cf0358e6a/13928626644.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/rupotarokewokarigo.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/22413246299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=discrete+math+workbook+interactive+exercises+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_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 19472 bytes
SHA-256: 4c8080e306258ef10abc61aad9aab810490bb4a3c7b22cc2a773279ef04523c3
font_01_sfnt_off000142ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 11328 bytes
SHA-256: 8e96e14e0c8017d45e1b7b82dc8c0956484c93d75db7f7a824310f663b788290
font_02_sfnt_off00015d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1