Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fb33212e8d10d3…

MALICIOUS

PDF

54.5 KB Created: 2021-09-25 00:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb884c14448c8d635eaedca00f52da27 SHA-1: f5c239edbf81cd4bba6c7e41b753821ab169b499 SHA-256: a9fb33212e8d10d301b9f81c00e70c7595538f72c976b378c641aa6cad50de68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly indicate a phishing attempt to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8114

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://allytemp.ru/uplcv?utm_term=how+to+bypass+lock+screen+iphone+11 PDF link annotation
    • http://mywayrtk.org/userfiles/file/pebinanozupika.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/lidiperutamegasame.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/wesaxumumevul.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/kenisudutukusofoje.pdfIn PDF document text
    • https://mollis.rs/files/19008789691.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109110135016136.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/le5nsd7deoo8267k50dih7ftu0/78265696654.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/fipevamusajabodalixib.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/gokava.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/raforikapulujefozonevikid.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/10053871119.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f06ed59eb455d1e48d25c244f51b09c0/napaw.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/51244439249.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/6564026754.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/5388111092.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/lixamefatewunubabafudiri.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/sejokireduvos.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/23617001092.pdfIn PDF document text
    • https://clinicscrm.com/img/files/fuxonavupix.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/2464541320.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mapoxubifaxuniduzoraxi.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/worogiwejenorovix.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/820fb6da90dcdb5a37d2c71c706c7b25/xiniv.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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