Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bbaf36e517bbd8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 16:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7a4f04a6d1c6c2e3efec71e416c18a3a SHA-1: 29b54ca7aaf9c8dce0e512076fe1ceb800bca723 SHA-256: 52bbaf36e517bbd8cc300f2af438eb79570f316a541e8fa52a8d1b7ba694d327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=collapsed+follicle+meaning+in+tamil PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7796964e84105dbd2f8a5e2e93e97294/40587805489.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082afbf3dad8---41050928836.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/13517474753.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/filaxinulu.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/rafesamowafufo.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/zotenevalofiziwubajalagi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/m3i896uevu0fpto9sfl30gr431/logazamu.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/7052095833.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/rugoxubikapojugobif.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/6epceno4176l1ngon84r9tntk3/47417848946.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8ced56c385e9de1d325174bb1d44ae3d/zozigevuzoxovov.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/keguzubinuxox.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/bolulotafogivovomereg.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea54b246a6---tunirexes.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/23798367041.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/rifuwawagizij.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/timujodafo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/26129248937.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/91158967282.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/zozugexabaju.pdfIn PDF document text
    • https://marosme.ro/hirek/file/71639189587.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd74bb009---pipuledumimemilugini.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/velrq4ljk47scdml8j5d4i4gk7/91817040513.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/80f04860c7082c5cad018af9ab63f806/dizebigup.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/kizijevig.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/11508190273.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_off0000df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF61 17300 bytes
SHA-256: 32b9f819281ef469983c96aed7e0aa5c9edb45c9f320e2762c780087fe292cd2
font_01_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 10892 bytes
SHA-256: 111934bbd22a5702f5d99e046b08c88fa20fffde01d08542bc25fec3b0513591

Open this report in the interactive analyzer, or submit your own file for analysis.