Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6c537a79a6e71d…

MALICIOUS

PDF

82.1 KB Created: 2021-07-31 17:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8c3658cdb838ef374dc351bcbdddc256 SHA-1: 5606e589b7c216d8f846cb17477af1516dbab2cc SHA-256: ff6c537a79a6e71d80fddd09349752ec4f0f5fa10668c131a9fcb9eeb077737b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting. This structure is characteristic of a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://arci-mp.fr/admin/File/24684709292.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/584d93956f307930a056c29268522f0b/2906861233.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160921aa74f3a2---87852273017.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/72062000234.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16095b6e30a432---wopakomenakaxibexi.pdfIn PDF document text
    • http://susanjeske.com/clients/82887/File/83037201190.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/52107bc8a148790d9bf2c4fa125a4634/42254008156.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/sivugesegefigazeraxukapu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/favosubesudopanebo.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/11403699850.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/31841079991.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/pobewifapomigi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/27662752143.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607509162ab2c---gatiwazawowakizizigejotoz.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/23809435646.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/21224411191.pdfIn PDF document text
    • https://amblamy.ee/upload/file/92511004858.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/nadudejuzo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/b4lh645aj7ki80susogtum50ei/71897904193.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/16597652443.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6b648f85---midanegifamevagusenetib.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/c26snkslok7hfblhv42bher9v0/jinorupusofameke.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/4693484110.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/lujevir.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/45e85f132e79b110a2aa472c2e217e01/buwupegor.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c16ed34f747742c5a44f02695fef7e7e/zowazosaponiwupezujukijap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=acordes+de+la+cancion+hoy+he+vuelto+madre+a+recordarPDF 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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 17992 bytes
SHA-256: 5560ad4c0c4d18c027a6977f88b9bc33a92a449c7a3cdf8c92e5cd1f08e4fe6d
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 10896 bytes
SHA-256: ba912b3b243b7be678150c468a1970ef14256a7771d73e07004d6cfacb516952

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