Malicious PDF — malware analysis report

Static analysis result for SHA-256 573465a3bd6f9c08…

MALICIOUS

PDF

87.4 KB Created: 2021-08-12 06:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d04f6b8f67f2092ec3e96b4b317201b SHA-1: 6bf61f0191b7ff183b1ffa52ad36f4b7ec9cfa9b SHA-256: 573465a3bd6f9c08e4eac05998ebb42f2b06b89b51a28c351df3b6fdb5583c66
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised CMS uploads or disposable hosting, indicating a likely attempt to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a downloader or redirector pattern. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ghadir-eng.com/userfiles/files/13185219981.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0fea25bdc82ccff72f7ad57a645729b/57293870989.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210701225402427209.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/rironedavosadoluzedekix.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/19293246972.pdfIn PDF document text
    • https://emmaushuis.org/pages/kitefupesifotuv.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a34161009a---9839996094.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/9628287577.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0eeb67aed9671c85acecfaeeffd634bf/9295884372.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b7002e77bed422b834734f2f441f32b3/xusewuxavikixewapatami.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hj50u0dgse15a1bb53cqeajej5/rugurexokor.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/polologunosuluwatopogudi.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/bec942d653560fb42272d3b1ebc5e874/23658082255.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0baf114a2ecb92f384b0a4f00473bc2a/84613166150.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/18797657770.pdfIn PDF document text
    • https://5udua.com/contents//files/59365965087.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/93131460860a7eadb25d38.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160909560f11ff---51119372320.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3650aff5373f670a21ebd33bfd9a9dfc/vaxanakokapeneki.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9868c7b4---7308523896.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cb44d622f---gafulufoliromapizuzeve.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/93196111390.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd675fe54---fifoxinizosun.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/59260018573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ajith+kannada+mp3+songs+downloadPDF 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_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 16936 bytes
SHA-256: fa35799e375fd4f51187d2fa86f2aca577bfbefe0a2497732ad3a4873842f3f0
font_01_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001364a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364A 11068 bytes
SHA-256: f24cac4da2fd98c48e3b063950b442936ab39ac543cdb70a3f32d6f5830d78bf