Malicious PDF — malware analysis report

Static analysis result for SHA-256 40764a9a7aedc16d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 01:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9909a359881c8d3a11a89fad52bf450c SHA-1: eed1db85541637b981029902d916640c999536d2 SHA-256: 40764a9a7aedc16d44b282b6e3e1427203b80969e4a9a204ef26b1c6d6486e24
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable hosting and the use of UTM parameters further support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • 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
  • 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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cf11d0513aeb713a7bcd833d72fc9bea/vubigejipul.pdf In PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/nelewedogosudujamububinij.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2c3k7v4l8vqecpdg8dhl844opr/zewovetaguwedepab.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/456fa0bdf0bc76144a38b410d587c6e7/zoximafitesun.pdfIn PDF document text
    • http://ahchala.com/img/file/58124522292.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/dujoxil.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/winawigu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/29a74a692761508be84504de7d38097a/warevamemebetinoxukozowes.pdfIn PDF document text
    • http://kd-council.com/upfile/files/fiselizoxi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3709a79963---74787816920.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/77827951369.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/pabakekoge.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/lewidorowi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f729ac682---vokasuz.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611da8eadcfaa---32688655360.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/eea0b9aceea1ff4f28095f64d56ac76f/40064672958.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af696914d3a---xidozezijoridaxodifejig.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f0d76c09---vatujupopamifejosoguvi.pdfIn PDF document text
    • https://foulardfotografando.it/file/92494780497.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/2346573994.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/direxukidokoxor.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/madeluwuzokedubofu.pdfIn PDF document text
    • http://melvin.cz/data/57281097666.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b1155b75---tuponekaze.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/birulobofupimuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=differentiation+a+level+maths+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 17456 bytes
SHA-256: 1db8512e879ddc7a5b8d0529a1e8e44c92d4a469f417a731cfa976c567c9391c
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1