Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a5d5e0d3e7285d…

MALICIOUS

PDF

81.6 KB Created: 2021-08-15 11:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69cf7920cc72febd1f6106a3567c91f9 SHA-1: 0457bbb75d2d09fa20d2ab5ff226d95c80cac158 SHA-256: 31a5d5e0d3e7285d1d7be0b62493d4b2107c5a14c5d02825d39e0eb2bd96d27c
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. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests the document's purpose is to drive traffic to potentially malicious or phishing-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8512

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://vhshf.de/File/fesexuwidasegoloxizi.pdf In PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f341b3cc1e1572988ceceddae11b4dd6/21089952266.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/71328840570.pdfIn PDF document text
    • http://asvpp.fr/pdf/vinikojilulajelavilovapig.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/dufuzawerafisute.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/26942083909.pdfIn PDF document text
    • http://fitviewer.biz/files/file/kuxelotajerupim.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3cc60450---95225789832.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608282cbe6f32---kigez.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/8790468258.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/5648554895.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726504f1f2c---71796047329.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/q15e62ter4hep2qkugfno49iv6/golorobidijufeloxot.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/qmmc8hr9smevmfo2mhbb5ipkd6/dimufiw.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/kulafujat.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/30241940269.pdfIn PDF document text
    • http://lawyergz.net//uploadfile/files/57959703122.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/94138533484.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503005451710.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/15057543341.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/waguvejaxepoju.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/jilepefulibujoz.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b0dc26293e64a69774865dd16e0d4154/11394565013.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/80816618578.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f0e474342e07159d01494755f40f38f1/70322437085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+use+of+driverpack+solutionPDF 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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16788 bytes
SHA-256: 8d34fc4a01d862f985c1781080fc45ac88e7ab5d7d6022f45cffe0e08a067343
font_01_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1