Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab258523b9a5ce1…

MALICIOUS

PDF

55.7 KB Created: 2021-09-02 18:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a5e6692993734b0d8fb1bdbbb01d0e0 SHA-1: a815530136c0790fcca83f6cb86286e4fea473eb SHA-256: 2ab258523b9a5ce1d28f013f3ad83c1441b378aa4adf42d82687e0526a9fcbdb
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into downloading further malicious content or providing sensitive information. The presence of multiple compromised domains and the nature of the links suggest a coordinated effort to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6318

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 https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kf5159pb5djs11j949eijjk742/67990923100.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/nopozirixesanikifiro.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30ec3788f---jewixijajodok.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/wofoxu.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/64167758572.pdfIn PDF document text
    • http://sakem.org/userfiles/files/zeliliziveredevitiba.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/lumupeb.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/178133e126b3f5ff73639306861dd974/ruzirevimojadel.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/82406075675.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37c2996b18---54808303980.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f238218c999---82955677672.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea97bdab680e05c5ad9243a1ba368465/75622639716.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/99541314749.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/92733407723.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/modopisimepiva.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/49206107410.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/45241874543.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9d100faf76b2105f8260477f16062b5d/56895926989.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/dacafa5b838ccac4ac5c43caf00c9c50/jerowid.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/29519925971.pdfIn PDF document text
    • https://geo-decouverte.kenamedia.ch/ck/ckfinder/userfiles/files/luzenowetororik.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f8807516---81910167835.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a71a2caa37f---45491620512.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/fibirakusi.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/49034426744.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0609c27f---85237005741.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pezoweligefuzeduba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=esl+grammar+worksheets+printablePDF 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_off0000b733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB733 11000 bytes
SHA-256: 1a3b12fa7cf7b6c64de7d54ecbb8a353b56512d0011b01137b32473dfef09df6