Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a17c01c8762b56…

MALICIOUS

PDF

93.8 KB Created: 2021-09-22 17:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab0d2975e3e90c4017b2f4479f2cb5d3 SHA-1: cbfa48bc73d04ebddb487ca9bd1943a6b51e0a37 SHA-256: 33a17c01c8762b56d5bb825d994657be2b19c58d440554bd3b7d0c0360dab004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution disguised as game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140919a60534---47434573727.pdf In PDF document text
    • http://bkht.vn/userfiles/file/joxebuwazabujixoxib.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/gerumavuponupidopife.pdfIn PDF document text
    • https://iohrp.org/f_files/files/81065395028.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6b22d7c54556e05db7bf4f6add060b9e/luwitibitepakixutepiwama.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/vexeleriluponoz.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/kizoz.pdfIn PDF document text
    • https://penzion-palice.cz/content/13564383246.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/firigedaduzaz.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/wimogus.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/rutorobokirepo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0a3e58ad3b63c3c4115f4db95cbdef84/luroma.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210917_382BE3C7892C0894.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/vuwozuzerowuragi.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/36686110372.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021916055175902.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/30144166595.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/budonamozobewafevegosorup.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/tekesuz.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b859c32456---fesifezotoresimuwakip.pdfIn PDF document text
    • http://mp-journal.com/media/file/5253654525.pdfIn PDF document text
    • http://myhoteltrip.com/userfiles/file/51503473286.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/36399848706.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/8686350072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+mega+emerald+game+downloadPDF 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_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 19048 bytes
SHA-256: 2eb4b35b0b974b56700c41cd1f331dabbcc39f89ecaee84261a07a3eda6d9b91
font_01_sfnt_off00013a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15271 10412 bytes
SHA-256: b8a1cd72ac258bf88aa389a704e8e2a7c40ff48c8809f888186da74c8eb0edec