Malicious PDF — malware analysis report

Static analysis result for SHA-256 813ce63bbff21ef7…

MALICIOUS

PDF

105.3 KB Created: 2021-09-06 23:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22075853963dcb594aa3b4365c0a82f3 SHA-1: f5fe8e88fa5f3d1d2293f2310bcb19d7f8080464 SHA-256: 813ce63bbff21ef7f547c9e19bbf24b3ffb4d17d090fd67e0fda7c6ad2fade7b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=concurso+prf+2018+edital+pdf PDF link annotation
    • http://rococosofa.com/files/files/9346982342.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0ed2dcc2---wofeweb.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/1cd887a2cc976edbd4ca6ebe4832108e/68438933607.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/limolasatal.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a82ce01c315---relusirutirigapunidilup.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/zitefitikubaxirowikepowux.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609173d800cf8---66336431568.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/52373245532.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/39231342239.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcac43764e---nutile.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/penukuxenoteletarege.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///64560162533.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cffc73b61a---61967554964.pdfIn PDF document text
    • https://lod.la/images/news/file/51610933051.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160804e79e2473---kupenoputebotubatolax.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/009fa2ea519773b1c2e59f849b5e3f0d/14049191857.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/cj3t0gcbjk19e7uohofes832il/13805608877.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/40889147953.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/navajixe.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/xijebikiliwipetana.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kre6c2u0tmoa8jur4a11mmpnl3/32381423567.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/xulobukidajobadil.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16123c421450eb---wujisunomizilisa.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_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 19976 bytes
SHA-256: 7ce120ab236e157c670d17ea9ccc0a0c5f56a8e27aff25b5b66bc5967718ab4c
font_01_sfnt_off0001653e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D55 11244 bytes
SHA-256: 81b5ce295a6920f500248498c4151c2c914c218537cd19a1eda3a1786c3c5ce0

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