Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc9f05f49b7d3f2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-24 05:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f168f6e1e6db0951208022135e6b3e40 SHA-1: 5e54c95305d41ff2d7043640f1f46f7bfcbdd5bd SHA-256: cfc9f05f49b7d3f27c0709aa0bd633e83e519ad3740f0ef181ca91185428da5f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://garglob.ru/uplcv?utm_term=geotechnical+earthquake+engineering+lecture+notes PDF link annotation
    • http://saxonrt.hu/img/userfiles/files/vumibunusulegajekofawe.pdfIn PDF document text
    • http://citra.cl/userfiles/file/noxexeregidufifazevo.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/22847756354.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/weratelo.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210905223350557772.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/siwuvolafomegitadijolexo.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/zaluxofofeteteritizegedu.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/19187401593.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13cc55aa5---30884554822.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/dosoju.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613408d77e2e0---dosuteluxizeju.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/26072098108.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/rapoguredufewezu.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/faxonasunegote.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/virakexukovim.pdfIn PDF document text
    • http://pactolous.hu/upload/file/33352026542.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/54041319784.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614920e053f24---66774949824.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/vafekuzaned.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109200506359369.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/pavofigejedanagukibizuxi.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/92874161783.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/614c6c2524a47.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/39551564602.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/28100971963.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/16790693877.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_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 17208 bytes
SHA-256: 353689bfb5fa9830c117cdd4ab9eb65a1e1416347975b0a62823d4336dbc1187
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 10888 bytes
SHA-256: 673df87e6b959331e0e7ee21d8b40e978fed5d4f8272ff4973a9845089b22e25
font_02_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.