Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ed32056eb81a6f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 21:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6fb51913bcfff555b1d75c09fcc6cf46 SHA-1: 2a0d42430e3dc8249c12b12dc75b407e2f37782f SHA-256: 05ed32056eb81a6fb443faccd9a60ff7f0962894b78f3a529c9be84d68174dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=fruits+name+in+english+and+marathi+with+picture+pdf PDF link annotation
    • http://terezmisszio.eu/files/file/wujip.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/17af68d615aede0189d1ea77681faeee/41811677591.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af5554156---pisokogepaz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d6a228cab4eeaf19bad9e4a56610bec8/55567529770.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/81561891391.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f5855ad27---91981895195.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/xaxukubugudus.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1b4a3c4c1---vulepopazageki.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/mumefovix.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/ik0a3sp8bmg0mq78i0adtftceg/woxez.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6997b8f7c---30992895962.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/11727901810.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/baponatugesogalanujomo.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/85861456008.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f0a3e470---72252757516.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5517b52a9---lixunipudegi.pdfIn PDF document text
    • http://email-database.info/userfiles/file/divubukugavagalajodi.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/65551419144.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/daxakubobepivagowuvisagef.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/milifabe1629091164.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/38652167887.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ajevi0vupruf2bjloe2ah8h3at/93583048624.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/lufedotugiretefagetixusol.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/63105492536.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/17528583993.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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 11112 bytes
SHA-256: 24c720b7ff2a4cc8fdb58821958fafcad2fdf677f1fdb6ad38533f14ee46d079
font_01_sfnt_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 18112 bytes
SHA-256: 913eb044bf0a55009d1b76010138eb358edc7abaaa99a6df343421a9acdea1f7
font_02_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1