Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d17173f2bc34ebd…

MALICIOUS

PDF

79.3 KB Created: 2021-07-24 19:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51ba7f80aa27660234eed8e7d5be904e SHA-1: ae04dc8cc2b6fbf0231e4d19d2c9e79ab3abf462 SHA-256: 8d17173f2bc34ebd60b1519e83bc13ef9473d69a8ec1ce9ab0e6f2259cb1dcdd
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6637

Heuristics 6

  • 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.
  • 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://anaminfo.com/attachfile/file/71245702131.pdf In PDF document text
    • https://clifestyle.net/uploades/userfiles/file/kuligaguxomisasowuwitoves.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/boremafukuvudedukumepubaf.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/sukifuvebeb.pdfIn PDF document text
    • http://charivne.info/images/file/61104921615.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/g4ihmf233p8km1fjkubgugq7d5/marugujavasakaxab.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/mezuxag.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/01cc358b14fa97cc5613f83ca9c190f8/49252150848.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/tidagujofagibata.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e9ff3182f8da2337f27dcd374cfe1a63/tirexewi.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/32933153679.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/xisajafi.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/19180507547.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/0r43k2n3mn8ufhasip1l8erlco/9862534132.pdfIn PDF document text
    • https://blokhol.com/upload/files/96448427064.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/pibuwifu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec88486ef---berotunogujit.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607280fc56d2f---10547257522.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/31anvbaiqljndogipl13mja1i0/36663485534.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/jitikivus.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0spbvrhdoj88s4pdhspd23mtv0/wijesirejitik.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/55136049138.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/06bfc37d8b60f8ccfb3786a795919e79/bokatopujofamuligotin.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/421bb9fa0f7e521f31abb4353aa0dc8d/69294281462.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94813a733---6277013886.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c822b6898---bosikune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+your+own+skyblock+bedrock+editionPDF 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_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 17024 bytes
SHA-256: 508ddab817c6eac06aa4f7b1943b8413d7995ebc6ff4a33fd95063056cd9a82b