Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b7c8bed977b2b6…

MALICIOUS

PDF

58.1 KB Created: 2021-08-28 22:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78677cb5d4fb3e08171c8d37a31918de SHA-1: fcec529af0b172d16a9ccf9fabd63521c66fb0eb SHA-256: 53b7c8bed977b2b6ba55500ef1766deee546edaac45459307cd38152e80c210c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the nature of the embedded links suggests the document's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

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://historia-bfured.hu/userfiles/file/37855755327.pdf
    • https://ferado.vn/userfiles/file/66242500680.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fc1c38cmrgaacmn6m4naeihpi2/72171485736.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/mukuwo.pdf
    • http://steelfurniturecn.com/d/files/tebazuforok.pdf
    • http://licausi.it/userfiles/files/mekipumodeberakojina.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/99324126109.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/85206b2389a260ad9e503e9b7f759977/68213579597.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609487ea54393---sadonofilixuk.pdf
    • https://mobilieroccasion.fr/uploads/file/lixejano.pdf
    • http://feg.vn/uploads/files/webewexatigituzivok.pdf
    • https://educhina.mn/editor/files/xapizajurikarafiwomidugi.pdf
    • http://gamax-motor.cz/data/dokumenty/lupixigosovidojuwunog.pdf
    • https://sklep-pinokio.pl/web/uploads/files/80846773657.pdf
    • http://dxqzx.com/ckfinder/userfiles/files/20210818_164711.pdf
    • http://sicilyontable.it/userfiles/files/salemuduvewavovadajokizob.pdf
    • https://denimder.org/resimler/files/niruxawatoditovodo.pdf
    • https://consurs.ro/ckfinder/userfiles/files/wuzevixorejolit.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3efaa805---dibimupisefinirunefigiv.pdf
    • https://unicon-msk.ru/data/files/wanekusekeganafaf.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/77e6946d8e40f55bfe6bda59d0dafaf9/raxibikufodonunawinadokix.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/qn442j1k34m4l7hsmsh5plepm5/94339478230.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/41b59c6a986746cbfe8692a2fc93acc4/51145265334.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c869ecd8839---331532140.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=principles+of+ecology+book+pdf

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