Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c4dec632270553…

MALICIOUS

PDF

92.7 KB Created: 2021-10-05 09:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b0b11374696ae1b0bd44e9e400b36c8 SHA-1: 3f81eb64fb565d0ddaac474fbbc9eb2a279cfa6f SHA-256: 18c4dec632270553b37d003beaf122b9eaa87e7b35ceeaaa638248cf29e0301d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j3mi1jm49sv2h60njki76mkqgi/netezelejebivapujigobe.pdf In PDF document text
    • https://silky.ae/images/bulk_images/files/54893468493.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/81110242320.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vepepozerifomera.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/5511844665.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/viniretibivedububi.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/59104045372.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/44718719791.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/45940835217.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47509c170---40651913911.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/82012910759.pdfIn PDF document text
    • http://gekon.net/userfiles/file/83074634945.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/88386443975.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/51406138765.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/tatirumomowalevuvakigadi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/nufeviwepa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d2e9867575a25d06e40489814020a3ad/82890057316.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109021723278175.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/jevukogemesuzuwajomadene.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/53170493448.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/gatawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=egyptian+god+of+the+earthPDF 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_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 10660 bytes
SHA-256: 9035c28b8a740a985fd850c5361a2b5fd4fad3aa406aa747d75679c6d4daef88
font_01_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 20116 bytes
SHA-256: 0059cc9efe4afa9b9731a0d23272eade2164e69822eb6deeb49fc6574319471e
font_02_sfnt_off00014d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1