Malicious PDF — malware analysis report

Static analysis result for SHA-256 87727a9f88eba08c…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 07:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 762b86e6613b5cb956526010308ae879 SHA-1: 6fef4da02aa7565f856d2ed0de9cb9b0b9aea149 SHA-256: 87727a9f88eba08c623f4c3d3acf557baeee9baac139ba8d62aecdcc5cd4be36
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious content. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42c626cb4---35342205752.pdf In PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021815223215246.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/56da2ba01a23ecf92dd0099c96dba70b/37351323775.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9821a8514f---37318170388.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kajelanasujumobe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704c9bbc4f2---36798924245.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/mamadojaxu.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/tagoterovagojese.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9qb1trbo17t9qlttkin4t9jpmi/fakawabariwilosozuvon.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/54969584747.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c5204189a---82919303127.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/65172778439.pdfIn PDF document text
    • https://medtek.vn/storage/file/73028863940.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96128559284.pdfIn PDF document text
    • http://babamoleskine.com/files/file/9222066308.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qkml9vtnjs56di6ce3k0sju9h0/55918915423.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c112cf923d2594db05f6a72e12888b9f/924399738.pdfIn PDF document text
    • http://dges.in/userfiles/file/20598172059.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210727180307.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/40600274240.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/99556787629.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaeb671c25---76564490592.pdfIn PDF document text
    • http://dso-fuzine.si/docs/rebowibipukuwetajenuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=suicide+notes+michael+thomas+ford+free+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_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 11060 bytes
SHA-256: bfefef78718b0c931bd85d46852c010b00818e2d82687a710c172ea85c551f21
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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