Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a416e491379166d…

MALICIOUS

PDF

97.0 KB Created: 2021-06-09 23:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d586f84408b714572510841c5de58950 SHA-1: 484fdf9422ebadbedc3946d23b43e2f29d95a946 SHA-256: 3a416e491379166d86f067e723a1cd65e7aac25dee6e42f6287505f0a8241a1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many of which point to compromised WordPress sites hosting further PDF files. The links are disguised with search terms like 'my hero academia season 3 episode 15 english dub' to appear legitimate. The primary attack pattern involves redirecting users through a link farm to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://medvor.ru/uplcv?utm_term=my+hero+academia+season+3+episode+15+english+dub PDF link annotation
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8159d0678c26e1fdbe9a523cd422c223/silibozefidonaxudop.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/74149738871.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/86935933209.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96d5271ab---sikijepe.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/10d6f690c130b5d17cbf1da30b6d164b/folekuxo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/4kejcrj3n8b40cq18b4gvl5vh3/kofezejerumojova.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa78d7ccf5---94293547242.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b253525441a---14659558908.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/18912958017.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080f46766800---jazitogedelilagijuk.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16078dbcade566---82857356289.pdfIn PDF document text
    • https://aedwea.com/upload/foto/vafukoporebefuduwunadobod.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210520032456.pdfIn PDF document text
    • https://airshow-bg.com/file/tilopadaderefisola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 4564 bytes
SHA-256: 8ad79177dbcc7dff8c91b3775a10d97e3becd973cbbcf17140a01b33791500b8
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 5876 bytes
SHA-256: 5925c89b0de21e1f91c68b6f9b73dfe6cc3d18461745bbbb3f6c04bb61a2bfcc
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 2044 bytes
SHA-256: 7819ef1de3348ad227e302ba7a5900f372fd4440a21f482bbf68fb1bc67eb97d
font_03_sfnt_off000126b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 12296 bytes
SHA-256: 3839eea212a41c0b77d6aa83cc791fabf897db3b3b28446e44ce7ad7efa94382
font_04_sfnt_off0001508a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1508A 16076 bytes
SHA-256: e7bbf0bca74f6ba17897bef3710127efb44abcf9298e3904bb3957032cc1d2c1
font_05_sfnt_off00016533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16533 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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