Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bcfc6cb74b8737…

MALICIOUS

PDF

109.3 KB Created: 2021-06-18 05:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 40613ca1d13c4e6e8f0e576d11423f7c SHA-1: 4344ec9cfa17229bd22bb17d6fb493e91065b251 SHA-256: 21bcfc6cb74b87377ffbcf9efce15f5d74a8867747f951f7c00e8a49b8e95956
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Hunter x Hunter' and authoring tool information, likely serving as a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://hoitruyengiaocodocvietnam.com/uploads/image/files/52658191470.pdf In PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210608_5A9376B7BE066837.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a8874ed27553875d93210a165aea0993/85939077691.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a03082184f1---napejidozuzu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/saruxutavak.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5283e963bc---wagajugoweb.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f62d262324a897e9e26b1db017942d0d/mivupuwegivoleda.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8eab91a9300937f0e1572a7293fedab8/4738301473.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/11415138933.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafc20d6b5---21024993756.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/lufkgr787ucl58utjsfchh76t5/ripujazeja.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/lufagixova.pdfIn PDF document text
    • https://mahae.hu/files/files/dufekofafug.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803436a9d21---28357244816.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4ufmdq54p7v28qlgru3391v0lk/90258277159.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/49021868299.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/35948554082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hunter+x+hunter+ant+seasonPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B9 4604 bytes
SHA-256: 940cee2add9f48e203fd7a1212ea4002770abfe601a5c00c15ce72e113114428
font_01_sfnt_off00017245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17245 11220 bytes
SHA-256: 190de13bc5eccfa82f2b1e8f965579e4416929957d0efd8ddf5514d2a4134cae
font_02_sfnt_off00019877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19877 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333