Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f23289bbce85c0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 22:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a717f88b8109652d0994a10cc4f87eb SHA-1: 7bc26c3efcb46fb8573ae731c75339bb343921f9 SHA-256: 95f23289bbce85c05cb769ebd5a49aafe6d1e23645a3b9b367332923faab9815
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://seednseed.com/admin/fckfiles/file/17006239507.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131755892fd9---93728949599.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/8311132591.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137632b135cb---38605683256.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131a00ddad11---27876338209.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/33836880599.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xiretavigezeloro.pdfIn PDF document text
    • http://quranday.org/userfiles/file/69921193940.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/rugodinoxosurimag.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/xinitoselimaxidazevo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9103be86---dafagelijigog.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210909_F3F3278CEC86F48C.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/20125433418.pdfIn PDF document text
    • http://trevorhannant.com/29516210028.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/saraliwaxusa.pdfIn PDF document text
    • https://iwistw.com/upload/files/29139024914.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/33610356095.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/xirusoxadutenap.pdfIn PDF document text
    • http://ned.ru/uploads/files/boxumigitasim.pdfIn PDF document text
    • https://bunianco.com/other_files/File/4088921962.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906012745566742.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/67759478160.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6baf8161d62732a017f0b0dd2c755909/9398985059.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/36148112971.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/75564103920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fifty+shades+freed+online+with+subtitlesPDF 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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 18676 bytes
SHA-256: 3b8a42f44a7071d0ea2ab3cce1e0490e491f14eb481a16351fa2766b0b46bfb8
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 10868 bytes
SHA-256: 308a070a2a5681c4057e97975e83d0daff407b0eddbcc56aa9832db6661e3d7d