Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfced476ef84dc55…

MALICIOUS

PDF

95.5 KB Created: 2021-09-06 06:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 794399df886eadb6699891ccd79f73b6 SHA-1: 21eedc8700036d58830bcb912e312b954fdb0104 SHA-256: cfced476ef84dc55ae86d1131d91f8ae723d47a40c8486ebbfa131db4569e78c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://limuzine.md/userfiles/file/tofenujijikewevalinubi.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3fb499296e139c4285fa6b59347a1306/datokesidatuz.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0af6ce8d---wuremujobatiwanamuvabi.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0ed0ea5b210f91244d75d0586da21e4c/gerosipopejanetevibo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/konomukolobago.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/mepunegimuwez.pdfIn PDF document text
    • http://18554080.com/userfiles/file/redoronividepixinopinizu.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/42627994866.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/xajebuzajokofa.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/17284990615.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/jiwuwarilasevazenepelukip.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/tawovowizebinavulonakal.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc87c220c8---kiduvegexovivupe.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/lapedafonininefasikake.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/16578049218.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccc80f7fc---43291927980.pdfIn PDF document text
    • http://falerisztika.hu/tmp/4693459142.pdfIn PDF document text
    • https://signika.pl/Upload/file/biratojojademezemunogele.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/90664104822.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a07b93dff9---83876420843.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/37393714020.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/raninuxis.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/damapusadelewozimo.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8073f269f1f2dd034971c1d3b0b4df4c/kapizaba.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/pimerewibubalod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mechanical+engineering+design+handbook+pdf+free+downloadPDF 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_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 17048 bytes
SHA-256: 4b5200b8fe348d5db587af2734d5425b4a4c8d36a90b97177c7be27ccc13b7e7
font_02_sfnt_off0001563b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563B 11112 bytes
SHA-256: 8d534714e04b3e44a0da9c126e682970986eb72fc30d1bd0f61aa6a0fd5c876d