Malicious PDF — malware analysis report

Static analysis result for SHA-256 027bbe8ba23ebb3d…

MALICIOUS

PDF

91.2 KB Created: 2021-07-26 02:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c440c8ca9f9bcd76952d63bb55a6eb3 SHA-1: 7a5123a80dbd8580608dcbb728e291a39ef78152 SHA-256: 027bbe8ba23ebb3dfd7a58d2fba5603ba93f02c23af79b8299047ffd2d61d9ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a902d63f8cce9cd95184c88051a4cb5e/sukatasufutarudiguloful.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2aefb1366---lutixuliluzevugavi.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/43377002168.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/38770053082.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f214ee1ecf8---22201941413.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/lununaro.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2fcaedfbc---serudu.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/54771505698.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/13f6dd3ffedacfd67de34863b1114d2d/fixasomigesi.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/5965103505.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/wukapimosako.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608342dfa0795---gojejifefopozoguva.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021517819384533.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/magiwo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/forigu.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/48813871206.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/rakum.pdfIn PDF document text
    • http://zae.me/datafiles/file/92347425911.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/vivinitoxipok.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608364b3565a7---gapazarinub.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b5c51c142ee9d785591c49438b102dba/takabalometevetubasobibe.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609476035f8f0---vururilujipuruk.pdfIn PDF document text
    • http://russia-ex.com/widena.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e936c390810---3500558607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=campagne+donjon+et+dragon+5+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_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 10832 bytes
SHA-256: f38bd1e210fb51b58efd9d9e2be2cc7b5fa8a48bdfae9e8ea3923f89a1a0946f
font_01_sfnt_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 19348 bytes
SHA-256: 85a6a451c7e5ef07f7c025241e81bea2381cfcabe6e536b164800b08bbf180a1
font_02_sfnt_off0001452b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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