Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bfd55dbaa48f87…

MALICIOUS

PDF

84.1 KB Created: 2021-07-02 02:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 46fdbfc635c1e5163d0e9f8cfe71d9f8 SHA-1: 98fc6e3043345410017e851fead20d00a4fbbaaa SHA-256: 21bfd55dbaa48f87e154bcf64d0d8eea796b1e8dae4003fb5940c2122f55826b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=definition+of+marketing+strategy+pdf PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c44b6453---12961622273.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16080735ab7fa1---mokexaguxi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/9fa71b522c0981f63fc97674be1ee7c3/45924412304.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a6a7063a0c9b8eb353ebe7270a3834ed/4660138775.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/jos6s4g9t1mc69mn5k0vi62hgm/xadazafomajevavejuwasobiz.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbe8a87dd2---tijibovizogiwasubeloxojer.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ee463928---44738698770.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607acff239920---pejajoto.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46e324ffd1---tebib.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076590616fcd---53773765931.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d170243618e704f9bdfe7afb33e4e809/30114635981.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead3459cfa---87090425400.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/50726751096.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfb749e84---xedate.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210528190335.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/73527774051.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a7dc5f47---16126142834.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fugob.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/55588690985.pdfIn PDF document text
    • https://kildevangen.dk/files/64156987047.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c84c843eaf068bfadf92dd9b1f68a052/96529667543.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da59fe67c0---zesebewagikezexi.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/21389017010.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f97ced22---26606251797.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_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 15836 bytes
SHA-256: 08a1aeb708f437d71a79015f3876563b4d35ad3871b7d41b1fffd91c594e9b9b
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 11004 bytes
SHA-256: 86607617cefd392405d35f25578958122ba98f48b6f84c4b11360e55292dc5e4
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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