Malicious PDF — malware analysis report

Static analysis result for SHA-256 c412bc19fad51980…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 12:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b51cde1ceae88d0f900bedb88cdb73fd SHA-1: f8132494fc202b314867a802ffb75895eec01e74 SHA-256: c412bc19fad5198070033857ebc72d3df8afeb966eed4873fcf4272057f62854
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132455e1d849---xezidenabebunedogex.pdf In PDF document text
    • https://tatsolarlight.com/uploads/files/1588507559.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/66999982687.pdfIn PDF document text
    • http://stefani.cz/fck/file/74603640013.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7c4d12ba---wazatewomoxavawifabobu.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/xoritorali.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0jctq3pbs4modvoai8lpgtrv07/dubagifoket.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613407875dc6a---84618174258.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/v0i269e8adb48e7lt4i595abom/xugutikogejibutuso.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/jivilipupumamajinib.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/rezije.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/77238894207.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/37153633414.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/kupatufuxodemaxuxelujepoj.pdfIn PDF document text
    • http://slovoveri.org/userfiles/62121714005.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/16743674072.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/55892735.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/bozoburifojorasipo.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/bamumafovurimofikuvop.pdfIn PDF document text
    • https://birotex.rs/images/files/84345630999.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/gisuf.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/55366317946.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ar54oojnlbs9cmv2f6qkjkofs7/vivakamezasinup.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81164886089.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/ruzozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=televizo+mod+apkPDF 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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 19080 bytes
SHA-256: a88dd803995af91c16a04d375a648d1b06b685edb90ff70b8759e1fae3ed1674
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 10264 bytes
SHA-256: 4fa9b9a345b2141d118109b9c9fe1cdc9d1655a31a00dc48606d03a6056f47e9
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1