Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d10d97923aad00…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 21:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2d8169c64d1c965b6dfb8ff33426d18 SHA-1: b84e23854ff75a6823c92c23d38e54439120c69b SHA-256: b8d10d97923aad001d6f5a9c35ed07217fc75f27c3bee0045517959f1807e875
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to trick users into downloading further malware or engaging in phishing. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=how+to+open+screen+lock+password PDF link annotation
    • https://fond.ru/userfiles/file/dikawifujedel.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/49685592677.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb60bf2e53---menanonujuzen.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/27506162494.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/39f34d74d9ca609b5d8cac8379ccf046/woxadum.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/26087791566.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/86176191377.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/74765179045.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361dead9196---nafevebanowewovezoxabulun.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sekarofamusilagavogik.pdfIn PDF document text
    • http://exosushi.com/uploads/files/fejuwetiv.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/gofakoxa.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/jakoranutapalumi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/8b01eb85eb23361c4bfce0158f2bec88/bovujufiwazaxuz.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/17018014730.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/xekudilizolafajorada.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/49686564331.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/32619589496.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f921f3a06b---60405476288.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/64709826171.pdfIn PDF document text
    • http://www.bash.cl/media/file/duduwofuvuzumut.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i588n1bmtpvi07nuav15kdjcue/16173123054.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/vuzinifomo.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/malejimodowaxeleme.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/89715d8f1c3e8aae3b414144418879a6.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/10488169666.pdfIn PDF document text
    • https://coluer.ir/documents/file/72441065257.pdfIn PDF document text
    • 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_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 17160 bytes
SHA-256: 3a78f852be77fbbea9b3a8edb1f39678713df7ad22e8b5c7f8479e133242522a
font_01_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 10584 bytes
SHA-256: 1ffb039840046345bf117a41a870e961ff7cde46659ef4d620354b5d1aa4a49d

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