Malicious PDF — malware analysis report

Static analysis result for SHA-256 923e6062803ebd90…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 14:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 860953511f657e061e40e96d31a69fd3 SHA-1: d25808864b2da8f13ba29c1fb63374d7b99391e9 SHA-256: 923e6062803ebd90184d384f304fc182425ac7c77c1ea7d74ab390701313e7af
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the PDF's purpose is to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.supair-lux.hu/ckfinder/userfiles/files/31519979522.pdf In PDF document text
    • https://demircanticaret.com/userfiles/file/62584938745.pdfIn PDF document text
    • https://limsurdua.com/contents/files/denilotagupis.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/zegemizavefumuwuf.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/13141639466.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/wamizaperadofimuguwida.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/rogawope.pdfIn PDF document text
    • https://baptistfriends.org/media/tijurerusipipedu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/nemegisagetuzi.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/daxerozemamirig.pdfIn PDF document text
    • https://tekmaker.com/upload/files/53523708495.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309dd71d40e---gujabejuxazizik.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d9202b3d93f3a744e59e6d1e195f6af4/liredatuweguv.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/riwawupuv.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/5205299368.pdfIn PDF document text
    • https://fultoys.com/userfiles/zuwukigi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zaxidumexiva.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zipunezeramesofakokami.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/14544828580.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/5712711241.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146b65110800---46709078185.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/ruwotubuzut.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/44292201954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rbx+legends+promo+codesPDF 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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 18332 bytes
SHA-256: 1c1ba6cb1eb2ec746faeca60dde6b216c987afdaeae0725e4cc2ddbfa7b876ec
font_01_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 10792 bytes
SHA-256: 0e9835ca88ae30aa3083f083425271c98a9ce4d12187b3a404fd52eca2cd24f7
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1