Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d027f542b237b28…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 19:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 311828e143b701395b21318d1a9bf626 SHA-1: 854e59d59d8a6277c538c5f28bb9047f88103276 SHA-256: 2d027f542b237b281d6b7893f3c2ef3ab7294a3561e9c2aba7ca091726f4ac70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It functions as a link farm, directing users to numerous compromised WordPress upload directories and disposable hosting sites, likely to distribute malware or conduct phishing. The embedded URLs and the structure of the document strongly suggest an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://kunmobile.vn/files/uploaded/20210808/file/65537626790.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07436e232---74150109799.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a89317e5ee8---merumetowodakomufo.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/bemuguzikerunupov.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/jexitunujisaval.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762022c4ee7---laripuwi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac295264b27---64716873097.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/datudewegesedaburo.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ffc7e627064f00df95aad6d2d3fe5d28/davumujarin.pdfIn PDF document text
    • https://computerzone.pk/file/52151481995.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/9q48tnscpu80g15o1j6s89glv3/baroj.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/48402893908.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/webiga.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a207108ac2b---92064044618.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cf69aea497765d6cf7fede3c413ea127/64405480659.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3e9597e212e845813de76b7ce082e790/xagawirujifalapojexunube.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/remikajofixexoma.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/zojexipubekurip.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/mukenoponofivesuvufal.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a14719c3911cc193749eeac6341a1e56/84950973691.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/38684431922.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/5216809711450a4dd1c6efdebd315286/sefabofanisemem.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/66645169477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=derivative+worksheet+chain+rulePDF 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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 10672 bytes
SHA-256: ff90ed6cafb0c2537f4166e8fc3479a28e65f2d4c327e1a38ba907e9634bb35d
font_01_sfnt_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 17268 bytes
SHA-256: e2513861c2541d38ac766f18a05ed6c8618cc5f16a0e59ac4cac73c9ec6de55e
font_02_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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