Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4c3f8909ab4e1e…

MALICIOUS

PDF

72.8 KB Created: 2021-08-27 23:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8f61e8a715c8616d11e6c48ca10866f3 SHA-1: b0a7bf89b4d2e7ff067181b599de7bd52ff66b19 SHA-256: 1b4c3f8909ab4e1e09ebbbd456adab6a23718b018210a1e1b636e2a9d6784ff1
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS uploads and disposable hosting. The document body was unreadable, but the presence of numerous URLs, many associated with file upload vulnerabilities in common CMS plugins, suggests an attempt to redirect users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/36533461828.pdf In PDF document text
    • https://dm288.com/slicice/file/tebaketitiz.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/3144687173.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210807034852.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c981ccb6141a15bb464ebc59e669f24d/jebesafetidazebisutisas.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/51294913196.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f47b3b5e153---dikimikezibawajifotudo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a743c04157a---ziwebabisuvevawote.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9700be73---zojafinotiguxejugaluzo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0ba10361a0095bd344dd43cd98a99bdb/69786910169.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/13614203731.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/fuzugurot.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/74119698334.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/rurlndu6olff7upfn390f2ed73/64658903121.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d198f48274---75536735215.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608df724d78a4---37993308861.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609054bcca072---15236826928.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/78930422508.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/jafinagekipakipidudufali.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/cb44da2325c0f05d04f26609425790dd/26369141210.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/98182743364.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/97796473710.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/43714194052.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/70015691201.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/vukozetodusozida.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607814d54369e---73639035001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=type+of+reproduction+in+mitosisPDF 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_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 14436 bytes
SHA-256: d41f190f67558bf2d7e23a793462d57f55612d0dab89af610bf06ab0c8671f32
font_02_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10748 bytes
SHA-256: bc5b3a98c806f8a55d55c8c36cc7092347341b1cbde9b8e6bc6fe9679521d350

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