Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f77b4e0f3fe416…

MALICIOUS

PDF

77.8 KB Created: 2021-07-18 12:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5be90963795d067c19d67ddad1111b34 SHA-1: 4960caa08f4ae8458601e829bec202543813e1f6 SHA-256: a1f77b4e0f3fe416aa3d5eb67df0cf3c647901d8755d4d0f91ebf03435e7ccb5
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links on disposable hosting further supports a malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/aqndel65viqoslcrqir3915tmn/zobulodowozexa.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/wuvugapajaga.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/43039797526.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/dawoduguregupijonuzonox.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160df39d8128d2---venage.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/soduxovexuwigakusit.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ke3b7u0pk0cej6hjd9tamih7v8/tuwevaxasef.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/wovesefixuvinukuposuzan.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c176b095088---jetikilusigelulatego.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d8841a8979a9c010ba295dfaf42e53c3/suzudavab.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f34a9713ac752f35328bda0a12cd7d96/38249977415.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcf94cefd0---vukefifuvavadulalogawoka.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/46790723484.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/zesesafum.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096782e3862f---gewadikiguxag.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/12813636590.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/sejawazarodefo.pdfIn PDF document text
    • https://parkettworld.com/upload/files/xusiwexogolarif.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/sajenafiwojagemulufataw.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0643bca9e5---maladebozavejamevajofagu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8f28a956---sagisukivuwakagosuber.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/492esm6t3abn3lcrim0ji5ooko/kozufifapeto.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/12382128714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=masked+forces+unblocked+at+schoolPDF 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_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 10808 bytes
SHA-256: e86520ff839acf00e2e80eb390ce6c5cdd493eb73767673a618a90a19e64e014
font_01_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 16700 bytes
SHA-256: f283fe3c0269e3badbe9248d564053ee2df90158f923be432a08236a16ba9b89

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