Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebf6bebd6d3b8f6…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 13:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53e09461b15e27b355db6ba7d409048f SHA-1: e709685afda3fc83ab7543523a4e14bdcc28350a SHA-256: 9ebf6bebd6d3b8f6981c7df67cbfb2f1cdfe865f54130c29dbb8b929714cb8ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm and the presence of embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1e46ut1gmflfms5jg042ck54l1/rivubisetiwivufenefo.pdf In PDF document text
    • http://air-ned.com/uploads/files/20577116165.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/pcg9a6mmblu1qk4i3s5n5litfe/tejumitates.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jumifusexomaboletureweban.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/81753440432.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/geuidqvpjh01ood87f1qsjtr11/bilezexolugujarofemol.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/7479870664.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/58865596511.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/96d29bbba98c0dd3c1e7bd0e9a724f6a/44888561593.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dca621e7a4---24675058277.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090502190722318.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/narimenip.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/94481024731.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/d1pfog117p1gdm36gj5qn66k2o/xiginodejevo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zotomudobivobagimatukuzop.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/butikexid.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/80754920192.pdfIn PDF document text
    • http://esistore.be/userfiles/file/63287287343.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/30570363627.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tikufulaviradom.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2895068d54---97520680926.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210624055859.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/runegitege.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/pasiminawilatakuva.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/denuzewugorovimuwedemobi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f315c5933b0d82f57d482afc496aab73/zulovote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=uu+perlindungan+perempuan+dan+anak+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C5 10656 bytes
SHA-256: ef3d8be287afcf7598706f10405ba97fcfcdacb4e3d10513c50feb3d072b2103
font_01_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 16216 bytes
SHA-256: d7e499dcd0713b3ea57dede1b966389a26c4f00b62630737dcf76cf30b8f99b6