Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b05195e4855c4c2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 01:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd6d4e2e7126398311e48d0b822b5631 SHA-1: 21b31da2a041e3d76c08f8edc6c887046226b6dc SHA-256: 1b05195e4855c4c233ae0fdd0feba6bbeabd0c12398dc9cbc44ad8558fdca0c7
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing to multiple compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using compromised legitimate sites to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a923ea6c070d5de3f1a6a98e53242fb0/werodezozi.pdf In PDF document text
    • http://vrzion.com/data/userfiles/files/bepajuj.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/87876356074.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1cf61219---tefixoxenaxenorudux.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/dakaluludujebebir.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/251f59c99bf2d86a926a3bd1ad60470a/rojuw.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/zuvejoborul.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/85749155851.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/pixafopo.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/vobub.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/fodabegodofotosapivun.pdfIn PDF document text
    • https://kede.org/userfiles/file/3997014811.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c705ce31f0644f5712a173ab51967f9a/54231007504.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/modabiramudemoguzawu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/rinebalonijilakorelofu.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/30813498982.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/fegagilenawekez.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/boxafizoseturul.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9f15066e---63414559043.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/zekanopox.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/91250337664.pdfIn PDF document text
    • http://usateatop.com/_upload/files/fuberanupuwixilus.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/15606796741.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/17682686122.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/pitug.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0u3h0a1pojlanvglrvittvl159/21494234787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sift+heads+world+6PDF 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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 19844 bytes
SHA-256: d37c0ae0405fa43fd4044b8d3ad252c70e8182420ebb53a4ed31393f70e36399
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 10676 bytes
SHA-256: 7aa81acd3d023a1a916ad417b7819dec6de0264956cafd8e6fb9280815666248

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