Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b31eb5976b6a347…

MALICIOUS

PDF

89.6 KB Created: 2021-09-13 23:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bb7306179893c1d148318ca7b94e0e6 SHA-1: 80c0e057411e3bda7f060972a6359da018af06bb SHA-256: 2b31eb5976b6a347c4655aac7ab60656b37bf862419bd055d070ba148a23735b
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, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://anael.fr/fckeditor/userfiles/file/39043914483.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2g9qk40mu2cfqac4689jbo7mb3/retepijibudumebipefob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e432acfa---44994856934.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/14315748583.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/37999145184.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/54346769587.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862f9b789c---88021885536.pdfIn PDF document text
    • http://aquatherm-graz.at/files/74384358959.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/kojezeda.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/63313056942.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325386258ac---fegoge.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/punobomoxa.pdfIn PDF document text
    • http://rc-modeller.se/images/file///4823967911.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/29095252174.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/56650125000.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7tb5n7jdrn8ulc7pdkcck5ohb6/bugasi.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/jufesolovewesuxug.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/jesezomibipirerizimixuz.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/32276433080.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/36490402929.pdfIn PDF document text
    • http://tortugafilms.ca/adminfiles/file/dafawifexaz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/qjauuluulf0ng7nuqt8ff5uqa4/19914530020.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/21203438059.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109022115423183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=keyword+research+apiPDF 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_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 10552 bytes
SHA-256: 8fa6f20ea18f1caeb07baba23b331808ce2c81d02fef375aea688a7790d2dca7
font_01_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC2 17472 bytes
SHA-256: 8058a7ccffc34c3592586eb81452cd2dcce0e0b3e3000ce0973d17ec2c20de70

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