Malicious PDF — malware analysis report

Static analysis result for SHA-256 66eb484786ba7a27…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 19:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7191cc0a66d5f60b9b13861032310b5a SHA-1: 0120fc52db0d2ae35c544dd04ed6831bdf8ce12c SHA-256: 66eb484786ba7a275877cb416127802eb9cf1d4637e0c02397b5997a138d7d92
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised WordPress upload storage locations and other disposable hosting sites. The primary purpose appears to be to lure users to these external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sce.tw/uploads/files/60b7a7626ad96.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bcc1039ddc5b07c6c205b94f37849f9f/40588667414.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/sisorobebimibowanade.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6cvok9u8g0gdoocusda9vhcrt5/lerisonuzotuxepizaju.pdfIn PDF document text
    • https://aashianarealty.com/file/47790089814.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083082350066---pepipetakotubomerimeko.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/ldf1o8snituj71gtqh2ek9get4/36183947914.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e626e578b2f35d582b6f2f0d724727c5/linuxenujomuviw.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/30466822815.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/30445755405.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfeafa049e---gipadozakoraza.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b43c9571e---43079924023.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981a43c15d0---xodobolomufilokaxane.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/sugeposilitowosogera.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/kujaluzagolu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb80ba8c63---lugurobefulusavetif.pdfIn PDF document text
    • http://cortabellanews.com/userimages/50507787056.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bced936061b---pugir.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5k57ev9d7hu8cg3hb4mvbsuedt/luwiwew.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d1516eaec559d942965a0b8b4834c700/xedomawaz.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729fca7d23b---sobafone.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4kferq9uo0jgpcm299fpnu7mn5/62958974045.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608023e9ae098---lezozavami.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/tamerafazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=old+wives+talesPDF 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_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 10096 bytes
SHA-256: 9dc14b0902434a19d46b1f4b37e89ccbb7e0aff9765e23bcfbe7ae6c88c82430
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 16664 bytes
SHA-256: 2354c4e9ca607e45a3e4f1929621be071ef191ff55c62c73640f2459953bc9af
font_02_sfnt_off00013234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1