Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c31fb88b6569cc2…

MALICIOUS

PDF

69.2 KB Created: 2021-09-08 22:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e58b61ce26aa51a91cabaaa3d3f1b74 SHA-1: a5c2a48a7a7eefdbf84964d97f0fb71427c854f5 SHA-256: 8c31fb88b6569cc2931495d6f0b66863f505fda737669f9e1fc41befca726ea8
154 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to various PDF files on different domains, reinforcing the link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9142

Heuristics 5

  • 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.
  • 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://netcentricnj.com/ckfinder/userfiles/files/77990845833.pdf In PDF document text
    • http://www.ap-arte.ro/fckupload/file/loforewutarutenab.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zixado.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210908135013.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/kuzuzajisomisowosupigiju.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/60880821162.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/kovubenofemapukono.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc86e84e9---50126915253.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/503pedlmp58934bg5hvk3f0c4n/gogib.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210908110739.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134249c68dcf---87883463345.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/birijepezabix.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/tizipenivew.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/vebetixanu.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/99690964153.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/46729302a7365d8c277d4645bf8b5e0d/maragiguwuvamab.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rovipusotigope.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pozujekoxajujinobenuwope.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/54202212721.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/xasowuziduvogotovojelenag.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/12584014879.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/34112343719.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/63013995305.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/fogoxulumiwazaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=atube+catch+para+androidPDF 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_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 10620 bytes
SHA-256: e224264e0aafca4340e6f037029e193a1d4a1ee0df74b6072015b1ef47cfefa2
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 18900 bytes
SHA-256: 2dfdc9ce8f111596e58f9ed39e61d86856183122ec22c63f48bbf96ff9e4cd8b

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