Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1843bd60d98547e…

MALICIOUS

PDF

89.9 KB Created: 2021-09-09 08:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93c1500e139a8cd1e478982bfb5bb3a0 SHA-1: 11f1ec78ec43562bf9bd1081c7cd3d150778e863 SHA-256: e1843bd60d98547e4f1ad6eb0e052e2364bc990d0dd2ca6fe0f6b45578abbe8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/pikudexurulerabaneverarot.pdf In PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunaliwafe.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16309164814064.pdfIn PDF document text
    • https://yellowstonewildlife.com/leretolujatabafofago.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/wukizudot.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/sawaxiwawovukozomowuf.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/pipesozusetagelorezofina.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/nukuletemetakopemaziruxa.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/junur.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/38387795040.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/25922138055.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/vimanebewitadapuvenu.pdfIn PDF document text
    • https://intersat.lv/files/file/kegikovizinux.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613806be5dddb---33746694370.pdfIn PDF document text
    • http://kasargod.net/uploads/file/78578948834.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/68656368387.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/fixokib.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161360b1509436---26267271537.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/42114129519.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/83644712834.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/63537124688.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b877c72c1---11087279586.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/73893645665.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/68429084104.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/sulapodimetuvax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+10+jailbreakPDF 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_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 10492 bytes
SHA-256: d530d1ed426724deea07dcc5e1573bf37fa557dea886709e98ab50d999eac36d
font_01_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 17388 bytes
SHA-256: d01c5d961a9b802062bfc96aa5f3a1f92539f9d1084a2ac9f7f03e309f410955
font_02_sfnt_off000142ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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