Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7da8e93db4889b…

MALICIOUS

PDF

90.0 KB Created: 2021-08-12 01:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0fa74e32fb4f99dc1d97875b97a68a97 SHA-1: afdcc5219848da64d36b6405351a0ff4371cd196 SHA-256: 7a7da8e93db4889b80eb9b072207b807fcddce4dfc54afcd898cf5d868082c98
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various domains, including some hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://archiprojektai.lt/app/webroot/uploads/userfiles/files/jawanuvugakujajivepiz.pdf In PDF document text
    • http://fields-on-earth.com/16959391712.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2osvffeb3guq56btjjuj174fdq/21602427112.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gp3g1kgl85lcelebgti1e5mmbk/607632481.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/57802784036.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2a338cc4---61053463664.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d02914fa2---71446783665.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/92971242907.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ad9ddd1e---49068905858.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53ec07e2d5---25297170685.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/83511470092.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6918ce45e4---34162365129.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/00127277a51db39ba72f2a6ad93cb555/dusenizireviburitisaju.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e407cd05e8---44541337415.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/20930276752.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/dugaxexokumirepolul.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/foladodosajeduxodila.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929b8983f56---dexatesij.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c4cb0d8aa---63810206309.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0b245e2d0f2cd829a904d3c192a8bbaa/17400839811.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3mdkodb96diccds94s6uhhtj9l/48490725984.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/xowitizunotegedewuzej.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/galevogefop.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210618110821_64tjn5.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/651fe71d02c4d26903699425409069ca/lowepuz.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/pesiroxojavotap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ventajas+y+desventajas+que+presentan+los+costos+estimadosPDF 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_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 11200 bytes
SHA-256: 3b9065907f6ac960a31cd34f1ed4e7563bd4e97037667598a1adfc14b82cf5e9
font_01_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 17904 bytes
SHA-256: 050cd6e415e0033249b2f3fb78cfc05002c6b5120ee6717fcdc2af18ccfb9b3d
font_02_sfnt_off00013fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1