Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfa1e764ef64711…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 19:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c422eeb63f91a0d8b124d0a145ab6c6b SHA-1: e0bc7706b91a05d2feda270731a3bd98c53019f1 SHA-256: adfa1e764ef64711f2097e08371e4065f1690d66ea538948fcce8eb5284dd7cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the nature of the document as a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=nanotechnology+ppt+pdf+download PDF link annotation
    • http://adveotec.com/img/file/90858952785.pdfIn PDF document text
    • http://rapet.hu/files/22970743150.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kunaturegoja.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/napipenakojipeb.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8548532a---38867390102.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b58d1a1f---funoxoponerov.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/3573050319.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae28a64df74---jiwejokur.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/miwudiri.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wuvezivog.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/zulizovetutagaraguporuve.pdfIn PDF document text
    • https://parfumzone.ro/files/file/26201096512.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/rezogazilusoniseka.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/95096690b5fc7fde0ae76334ae8bbc4b/xagefutowegefuxunep.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/tilusepaborulimef.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/nutod.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/d728e7d0de53ba01dd1e55914a1d24f9/nasumaruzeki.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/tepapakanap.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/riwab.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c3014152b30b919eb05c33a96dc36ce4/21827435489.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/08e9b26c0d985c9103ba8ec2110a25a1/lotugodunutuboxidono.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/kuxivife.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/46902371776.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607534bd74d1a---26627237001.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_off0000c6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 16860 bytes
SHA-256: 7cba8bc45d3312bd8c1cac6decb6255bae35f3bc04176de5af2f48c6c8f26d48
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 10716 bytes
SHA-256: 95be248e0db251c138144c96695117142a239badd20fec1856c5929cf1c4be59

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