Malicious PDF — malware analysis report

Static analysis result for SHA-256 97714a4140ea0632…

MALICIOUS

PDF

66.5 KB Created: 2021-09-26 00:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cde6c975627f9e6056dc537a6d3babf9 SHA-1: 855cf179bf06c63609049151ea7870e3b02829b6 SHA-256: 97714a4140ea0632eb6c79f6dfc0e5d43c16c7241774168f57f544e26aa2fae3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals a link farm structure, with numerous URLs pointing to PDFs hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating an effort to disguise malicious links within seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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 http://warmistore.com/userfiles/file/betavavobawusiji.pdf In PDF document text
    • http://odessawa.com/userfiles/file/fadigojexawesof.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/sisawu.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/83041867787.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/41946796423.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111425473387.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/jitozodexagoxa.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/36022524158.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jf7ginnbv13b1qsgvdkfdqfqr7/15218571418.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/81254555775.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/94943891623.pdfIn PDF document text
    • http://allycatering.com/userfiles/59481418331.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/7887532887.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/17510791140.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210905152830.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/rowoxinajinanovedozoxiver.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/faxunabapozebobojuk.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/jeruxoba.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/bikotugaji.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/nirorularudevaronejovolo.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/63911865564.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161332c26155a2---62952477390.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f907b2c537---18733944423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=need+for+speed+game+for+windows+7PDF 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_off0000b5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E9 17416 bytes
SHA-256: 36cf78ddbd276d9c356dc35189442495979ee674e755723f8571603f839d4cfb
font_01_sfnt_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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