Malicious PDF — malware analysis report

Static analysis result for SHA-256 276a29889ff973fc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 11:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: ca5103aecc26596895808f9f79db8661 SHA-1: 9f094453a473a6402909ea89452187e85dc024eb SHA-256: 276a29889ff973fc91635c231c58ac59447cfc427d3f508109d508b433af7d6d
162 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8220

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hanasushi6.com/uploads/files/bupoluwuji.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391adcdc662---rimun.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/31803907095.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/tarafisapisoxinema.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/vawazajapad.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6f2fd22e6da4d3459b45c74fcf856ac6/miruzulijogudik.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/4902064346.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab6b15ba64---20997236926.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/rixuxerorirawaza.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/81021899380.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/bavexufa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae32f1508---kemisilososavodovewog.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/zubodupulefa.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613AF8FE514E7.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/34459647444.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/91458632322.pdfIn PDF document text
    • http://theponghop.com/upload/files/36059939195.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/53710201912.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210906095353.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/saneriwitulazi.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091011453473499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+platino+drastic+cheatsPDF link annotation
    • 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_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 19460 bytes
SHA-256: 401c983c29c72c7df26ade836010d006a587c96179c8af46fa034153fe0b2db1

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