Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f6ab875af12d8f…

MALICIOUS

PDF

93.4 KB Created: 2021-08-06 16:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c097925ad87236747b8c83cab55f4fd3 SHA-1: 842a3e7e9d1fff866a322d26afebdb7171f45d4f SHA-256: 67f6ab875af12d8fcefa2069c1db08b95d6202b223b808971cba1069e2b9df99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to external sites.

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://ketchas.ru/uplcv?utm_term=fantasy+writing+prompts+pdf PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/k9dg5p4gdnkhlkgnk2lfb9a4nj/xatovaxizitunivuvag.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/75145439247.pdfIn PDF document text
    • https://digireg.cn/upload/48904719717.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/vaxusorafozuku.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f122e82eb---jafanoxamagukijok.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f33249884---54914268478.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/3096677249.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d840e1359d3---suzugapegifen.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/bolipetopumekifesuluwus.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c54a1369---44160526895.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3sft4c1sr4lie6jviqccq4qtm2/pawupasateziz.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a1741d313a4a9b5921fc32e25c88ebda/zatubiw.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f2d97b2da195d416739b46f5f3184bdb/lekowojesudadafowuserabe.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/65401828703.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/24425528457.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/81385804490.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/65e45d356b385646ec96de5fcee9b044/28460758881.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/jipuvomuj.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/kafukatufazalesij.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51732930733.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/17f1fd82e20c4482e775df1149fd9e70/50468622208.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/xomesepedujitexiga.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lddmtk388lobiu7dio03uf7foi/26464476198.pdfIn PDF document text
    • http://screen.by/images/file/18367785281.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/7e634faef6a2ae9d7d3972c7b4f3b46e/57238985734.pdfIn PDF document text
    • 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_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 10840 bytes
SHA-256: 98e429e6cb4bcb4bf8b2530586a89f7e6e6cc8357aca808ad2a1d7cf3dd874f3
font_01_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 18216 bytes
SHA-256: 6bdd19cd4700d29502f3abbbc38ae82020ce7cff267778941284b9c5249566ec
font_02_sfnt_off00014fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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