Malicious PDF — malware analysis report

Static analysis result for SHA-256 618f1821bcfc376e…

MALICIOUS

PDF

67.3 KB Created: 2021-09-16 05:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c5d7882aba833492be8acd6a1d9368c SHA-1: ad95e91cfc5981dafb186bd370f8aa0d00640d0b SHA-256: 618f1821bcfc376ef855e9b9bf4a62610eaf6716153b9aa6f70bef332d7cf9a0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as a phishing trojan by ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. One heuristic specifically flags it as a 'PDF_SEO_DISPOSABLE_LINK_FARM', indicating a tactic to obscure the true destination or spread malicious links across many domains. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2894

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 https://fnb-concepts.com/images/uploads/files/rovilurewafudo.pdf In PDF document text
    • http://vivaibonomo.it/userfiles/files/52626127581.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/melomometiru.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1624_20210907073152.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/mozefi.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/zafuvoxisixipibezatagu.pdfIn PDF document text
    • https://epiphanych.com/images/file/80116724490.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/89321965097.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/52944563256.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/48843071041.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ab34c82e1e6c0616ddbe286c97659dcb/32681844888.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/fetin.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/talezox.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/xesuse.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pigetonafalugezepuviga.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/2193304162.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ro1kb5uh0mnv11npq830fc9sfq/vafirozikujewubupiwefenag.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8611baec5322ee2c302f5de6c614377/pedijuwevejimuxuxuxejili.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kitidinimekivozekad.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/87060437379.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4ed5b4cf849900a39cddf26435c6fd84/60878469304.pdfIn PDF document text
    • http://vititanon.com/user_img/files/mupuxokawofejeximak.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/25528141641.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/dibasowitedodojofub.pdfIn PDF document text
    • http://cwesp.biz/upload/file/pinizesesakekodivenajow.pdfIn PDF document text
    • http://agavietnam.com/img/files/69679011809.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/62282464976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bedroom+eyes+full+movie+online+123PDF 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_off0000bf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF10 10932 bytes
SHA-256: dc610f95fafc632c5c2eb3eb96f1f8d0bff95f0ead52ca575db040b7657ab2b4
font_01_sfnt_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 16444 bytes
SHA-256: b725b4bc98eb9cd6832be9d7399d1027b549fb01d26a67f8a761788be2a7c622