Malicious PDF — malware analysis report

Static analysis result for SHA-256 499aedf7382e50df…

MALICIOUS

PDF

79.5 KB Created: 2021-07-27 06:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b08f278ddb3c8659f73ba05a22d547b7 SHA-1: d9631470b63f57a5f629e70ec497984d1f1356ec SHA-256: 499aedf7382e50df943f23f2768b02fa90fcb49231ef0f3d8de08bcf6639163f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8590

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d02b9b10e---tefekonifagedinoz.pdf In PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/bvlqpir0talcsaeaq1330sbf8t/23424422877.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb10b121a---zanonuxemozijil.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/67955976887.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/posofetidunimuwarema.pdfIn PDF document text
    • https://bloomeng.com/uploads/vipasiligeniburonoriw.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/vapel.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a38e0ce7ec484e2ce28e896a2ed3685c/sisavokilukuv.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/vakizesamapimibawikoz.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c978aaad11---vugeravekelo.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pomubajomuzur.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/lilor.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/nixila.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/thqom52cn5oi2bsji0rlioi9ld/sigufiduvosunoxusu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b9c19617d1c22229e02d0b5db15556c5/kajexatikodawafexukux.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/80414446178.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084de3c16f3f---54623255354.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25332e545---tigaxujolinup.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ipe2l50u1j0v5l5da01lh48vii/gisafijako.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/39dc04203b3eb9ba22cfbebc7aadddbb/nabavekazomuda.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/87eec510c48049db2b0e14bd35029949/36243267964.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/tivububajekiziluzulegiga.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/pogizobazelol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=asterisk+password+viewer+software+free+downloadPDF 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_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 10716 bytes
SHA-256: 917af622ab85df92f74c104ab6597c90da4ffaa76b0de263a9cf895c4cadd626
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 17824 bytes
SHA-256: fd634093f1997dbc4bd69837a98b77f47f79d807cbf9c6bfa45184c8c61b30f3

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