Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd235fc2563fa0c1…

MALICIOUS

PDF

75.9 KB Created: 2021-07-05 06:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57b4883e6a44b560f32a79dd2817b7d0 SHA-1: 4baaaca96653d495ffffd24e946b6366b76bb865 SHA-256: bd235fc2563fa0c1d3a7ec1ac148f4a235ac16ed3aaf75528edd13b38eb65bc1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The document body is unreadable binary data, suggesting it is not intended for human consumption.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sieompaysdebray.fr/lesiom/txt/imgadmin/file/84314327518.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf04e5fee---jigosefafinetawidadoku.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/sefukirimez.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iaa12tpjsc5bjm5b4lpfs62j44/tiverir.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071128c9c9a0---48137666981.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/75296954983.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae70bd0ac---80225332556.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/44973339183.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/lirik.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/42579774516.pdfIn PDF document text
    • http://remobudostol.pl/pliki/71088724726.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/t2vsupe88kvl3g9bj5asb3v0oo/13618129141.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/fubaledigegetuperezu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5bc4b2bee---67261784700.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/099d59d229062a245294da0e6bb7181b/lukujovawabevoragirekaje.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609751e90c719---73997659520.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/gikumejowor.pdfIn PDF document text
    • http://tcihk.com/userfiles/16713983196.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3cfd6499c3130b1f12bb49469e997fec/nozofofofagozawifumate.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/ganapatufuzuzukesite.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/87003205390.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/54481852658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=too+little+tax+withheldPDF 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_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 16316 bytes
SHA-256: ec7df1d9795e89e0b20323ece62b5594492ac6c6358f13c62e795b5faf3128b9
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 10124 bytes
SHA-256: 7b0f7fbda0da28c2ab6ac1607283b397cecd9581ad4a86787ae3d5501ef18d9c

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