Malicious PDF — malware analysis report

Static analysis result for SHA-256 32edd15209b58e94…

MALICIOUS

PDF

87.5 KB Created: 2021-09-12 08:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8035c91eb8a5133ef5ed8ecc9d8916ca SHA-1: 4a8905741fa6b4bc1cfcfc436fee3d7d8f631017 SHA-256: 32edd15209b58e94db37d3f7f419d61ca5be352118e0c94ec00b1aef3ece546e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF files in the URLs further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--fiqa735be48e.com/upload/files/mefifubuvoxidakajasabaz.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb280a98f2---57110320615.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/mipanogabuli.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/77745556241.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/62443779998.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/tefukebisowuwinudeku.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9ec4ef94---38633038410.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/46884300854.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/49287311244.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c4ce27f8d30a40dafb29a364b3d8fbef/birawudoliz.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613d34dddc171---84115010286.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f1e3fb675cea0971f913430d78fe3992/gadiw.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-2/20210902021708742164.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/fakugalezomem.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/mutodaregasopav.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/19232818577.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac057a2c35---99966899427.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gokikeditipoxepuse.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dizamiriloferudivobe.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/voxanidazawugizutevu.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/bixak.pdfIn PDF document text
    • https://atavio.ru/files/file/rokedulirimenakanekar.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/gozebenejaf.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf90c1242---sikexuvaxafomulobavaniwum.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/molomeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=loci+patcher+apkPDF 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_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 17208 bytes
SHA-256: cba4797492ad41f1d399dda0fbf7248d7215c662564e20ac845333c9dfe8e7cd
font_02_sfnt_off0001394b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 10200 bytes
SHA-256: 7dd6f11ce7a63f3da83ebe6d16ae4b267dcac8fd586a843f667cecb08a3bb000