Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5668410ab9f4a8…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 12:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b017d9273c7d721124d32fba32047341 SHA-1: 07fb1ed9a3edb0c349214fa9020fd948336341af SHA-256: 1e5668410ab9f4a87c2df9ca480accea2f41c7623c5433c6c385c4678d19ee61
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=madeira+polyneon+thread+chart+pdf PDF link annotation
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9bgk8omj6asu5hqlom4rpr7c01/91462998610.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d86faf6b53ab15e572590f7294ecb17e/76397123627.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/najozupeweso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eccf29feb---vazekomisosudopevo.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d5e7f76df3ba30a82b1515337bf41050/pawabisazaxeravinixunukem.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef8b73f3c0ee3be32ad2ddf9732bdbcc/dabunikagugeta.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcef75ad507---24380252129.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da89df800---rupuxaxujamukiwo.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/91761644343.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ee518c89---47502343618.pdfIn PDF document text
    • https://festacontinua.it/public/file/31623708478.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/56124268216.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/167842773.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cjsnh3k9jpf1tfintpq3jk9nm4/dadewavogap.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe832b1c56---79609572550.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9b1b30a18b4749ceea798adb5c302177/wunofiwolefijimo.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/71913446664.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/e99d4b8cdb847149677ad43b35482d57/sobezupe.pdfIn PDF document text
    • http://hopsch.de/uploads/file/14897158909.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xakujedisuzebuxomome.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/68413016352.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/66289930861.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_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 10656 bytes
SHA-256: e7e5d6a61cddb395626eb6881353daa6aea3642031208a8533feb2c982d91fff
font_01_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 15876 bytes
SHA-256: 2ea5f976e9a3fdef1f61737af98de492e915fc0c9b1aa25420d0d8491c0febf7