Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d8fe8a24be66c9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 18:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d3a9a4ac35b21096dc488fc5fe32cf5 SHA-1: bed77aca2e548b73b06f646baec8b0254273efcf SHA-256: d7d8fe8a24be66c9e7e3407840dfa5e252c3ffb7ebf34bd052172d857ea67f9d
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on disposable or compromised infrastructure. The presence of multiple external URIs and link farm indicators suggests the primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4113

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://maria-galland.ru/files/file/nujafera.pdf In PDF document text
    • https://turkeyinsurance.info/images/file/72605109100.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/8489454633.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/19044309805.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/zixopazipek.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/84799863293.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/monezubuludul.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161302ea8ee9c9---86407414324.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48bc092a0---83543861611.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/tusevowexebevekazero.pdfIn PDF document text
    • https://capecoralliving.com/media/file/29949069878.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/pexixuvu.pdfIn PDF document text
    • http://stl-hk.net/userfiles/xabinawudegekibib.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/tajawupemoxitituroxe.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/40185420830.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4d44faf7---bopabadamadedoxuber.pdfIn PDF document text
    • https://clinicscrm.com/img/files/sizawubafifedalakok.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/32317231298.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/97779777678.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/61004802647.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/26638158452.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/896b3a0707db09ae77678a9b8020dbdf/38308599575.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/82294541901.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/47959041012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=redmi+note+10+bangladesh+price+unofficialPDF 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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 17964 bytes
SHA-256: 17b24fdde5d41b4c48b6a4f02b602f6f10799dcedf60f409d9b110c09fabd422
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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