Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa778ca422e3ee64…

MALICIOUS

PDF

76.2 KB Created: 2021-08-26 02:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91f895f52748ae1cf3bf8dd0591a1e99 SHA-1: 114e48e956d3c4add03ce39cc4de3d668ef48b2b SHA-256: aa778ca422e3ee64e7326ce5ec4d620ba21ba1a2b07b2486c7e8626dccf3093d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8596

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161190935a9775---22491615328.pdf In PDF document text
    • https://allcreaturesinc.com/files/files/53856538974.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/50037130616.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906fd3671dc---12872039382.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/688fbc8bf46bfea9c2e80e729e37af85/55218628154.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c1e3e9d002---42479031722.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/56217501186.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6babec629a---reduzadokazisagubeme.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/12527852638.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b0f1c38c---ribesumokum.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dc8a790f---44232623368.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/wenarojexavumu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/219b63ab27b56666ce9415a3971442b7/tumomem.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608420431d66c---gafaleveferaxelejabudogit.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/85393053761.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161205fc3cad25---40951177171.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/wasubudejadudapoj.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/68361468739.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/11314727543.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/86978190314.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/29181727848.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7aa29bd4---91903517631.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/32017250885.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f81db76ba---jukilatitalukaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+much+is+one+lapPDF 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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 18456 bytes
SHA-256: 3f485a76ed6156e4f0c8e08154ed3b31ca14301887b44e9b8b077659b0f33422
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1