Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48174bb3dadb8a3…

MALICIOUS

PDF

62.3 KB Created: 2021-09-04 10:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1cce20f2e6fe0a000c9ac33546f0187e SHA-1: 478aafc1a07ea8efe8207c9405d1b51ccd2dbb0c SHA-256: a48174bb3dadb8a36d56a3f317fb33df4b236a88441e478b295b304618f5fe85
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The file's structure and URL patterns suggest it is used to distribute malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5578

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://huntic.ru/uplcv?utm_term=wacker+neuson+pt3+manual PDF link annotation
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c93d9e5088d---93915701412.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/11413210196.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/67862250977.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/16163859470.pdfIn PDF document text
    • http://myredm.ru/uploads/file/18845625374.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/19465932569.pdfIn PDF document text
    • https://businesslife.com/content/files/tipemukuz.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/17927611758.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/neminaludagodogupu.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/30139858860.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/posiworo.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/59200093423.pdfIn PDF document text
    • http://castel.lu/userfiles/files/91752638125.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d143076e---nakivugovowizitapolo.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/1538951304.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/92094789348.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ac91ee78b---76855186212.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf548f3f794---zunuma.pdfIn PDF document text
    • http://technocom.pl/editor/file/fupenowoxixomajowosafi.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/watorusifotuk.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/61135708452.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bf455257170c8915a2cd3279de9e7ff8/35750098022.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/57lbh5ccapgnep3k3cna27po82/subiwa.pdfIn PDF document text
    • 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_off0000be01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE01 10800 bytes
SHA-256: 27d6fc1bff49512ada15b51512263a8df81a25c9f440a88efd6af9953b340e0b
font_01_sfnt_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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