Malicious PDF — malware analysis report

Static analysis result for SHA-256 c327b93169caac19…

MALICIOUS

PDF

87.9 KB Created: 2021-08-12 02:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44a0fce141bdfdcbf2c9001e195bf14b SHA-1: 109da4c8d66b327cdda4be29a3c0678c804f1fb5 SHA-256: c327b93169caac19d976b775f5ef5bd67229e24b67cdc73d74356166c40e4fc4
136 Risk Score

Malware Insights

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

The PDF document employs a social engineering lure, instructing the user to install a browser extension or update. This is a common tactic to trick users into downloading and executing malicious payloads or divulging credentials. The presence of numerous external URLs, many hosted on compromised CMS platforms, suggests a distribution network for malicious content. No scripts were extracted, but the ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=apply+sepia+tone+in+photoshop+cc PDF link annotation
    • http://asupuro.com/user_data/image//file/rugonazubusofuz.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084015901385---85072589006.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/86703472850.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/wimojapepifumor.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/t71aeu30gv4dmodeiqbgr8kirq/96950430710.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608180d509b71---renaloraj.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4090aa21bed3a70be76a84e578c2946b/97160143456.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a60994550a8---10624473431.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5ebh4onrj59o3kb04t6n9cjqm0/50697232023.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7ee193f7---88768062905.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/papokiralunexibanowuwowu.pdfIn PDF document text
    • http://sam-global.info/files/file/678763044.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/82664281972.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/dubosorokajita.pdfIn PDF document text
    • http://abpaluso.com/upload/file/83236687715.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608541d8c9c47---71807865985.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e0535441d23---daxovanexijifedegi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/cdcfm0na1kv322v4s36k5m4hu5/49916956223.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/nugutuz.pdfIn PDF document text
    • http://amdind.com/userfiles/file/paxozaduf.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070123415573.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aff2f632051---12341857679.pdfIn PDF document text
    • http://www.fotoliIn 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_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 17164 bytes
SHA-256: 4966cebff0b1b1c5fd5d55fa5b54904635936f0c8bc2877f43dbb3bb668fe98b
font_01_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 10464 bytes
SHA-256: 96b07ce9e56ed2f1c4ad7cdd5090126a04159ea34c3cace028ea89e9fda9e486
font_02_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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