Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6518c29a368ed3…

MALICIOUS

PDF

63.5 KB Created: 2021-09-20 13:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4a5cc3200dcec4028a59a050f0dc929d SHA-1: 440a57fb899dd148aaa7dff4f93e29138164d8b3 SHA-256: cf6518c29a368ed3399d880ecac23911175534dec2ed7c520dec1c74c14577b7
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload storage or other potentially malicious sites. The ML classifier also flagged this PDF as malicious. The primary function appears to be redirecting users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7270

Heuristics 4

  • 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
  • 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://namadagaskare.ru/ckfinder/userfiles/files/56183663155.pdf In PDF document text
    • http://naim.naparts.com/images/fck/file/23152762966.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/61c1f28ffa44a96b2e7b84b468b10c25/xegujire.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/70878589208.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/gudusimifof.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/86976822254.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/24545013152.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/95312206986.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/58161835240.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/89645712980.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/75897437787.pdfIn PDF document text
    • http://licausi.it/userfiles/files/zokakijijibijokira.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2hd8bd2f8oet4vn92cmpfa5v02/93225640335.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/namefetufebemerenut.pdfIn PDF document text
    • http://fullx.net/files/viwoxoraboropabub.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/94843729412.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/bafekevud.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e3552394f6c489e3ac0afa368b763a4e/87187757676.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/kovomitevalixuzorupezov.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/65796453777.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/79134586626.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7cf4f2d36efceb9f2f64d685c2b2dfbb/livenagojezekofolefa.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614712f0d33a2---78747410941.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/gizifujodavalisu.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/jozijobupirosuxijijizobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=block+craft+3d+unlimited+gems+and+coins+apk+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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