Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb21a1030ed91f6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 16:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 984d69410e537e29ad074a9238f1fa8b SHA-1: fe0f845b08605dbe0a844e0c37a7cd7ccfe43913 SHA-256: acb21a1030ed91f6f586067b6ec7c3ad3e75f1b8a970dae9fb269b881ce1ba95
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=genymotion+google+play PDF link annotation
    • http://hansungid.com/userfiles/file/38136761454.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93502831391.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/xawemedatereremilipajivij.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o76if5g8iis4cjvjfaljqmcddv/dobijukiwirijudulad.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/35964818161.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/99598356472.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/fivevipejajijizoregide.pdfIn PDF document text
    • http://zeci.nl/im/image/36701830608.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383bf9e0ad2---pojidunuvov.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/burewarigoroniti.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/laxusamefegi.pdfIn PDF document text
    • https://jobtiara.com/files/files/8512874597.pdfIn PDF document text
    • https://afayl.com/userfiles/file/14828940004.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/43484877654.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/38248383052.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/zukidavadep.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/karaluramafutebejinot.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/24465554449.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/46360272292.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/govaworego.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134335b28f65---moniniloxukurakedim.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/ximixiwomabepu.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/27110302626.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/xuxisuvinejodaxas.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ff6e5bf8---vigivolulabizaf.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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 17100 bytes
SHA-256: f755114cdd9aba3415da1110118be73bbe2aebb64845af9f0d3f00fe677dccf8
font_01_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 10480 bytes
SHA-256: 4c94c262b5a458ccf23aacf21967cf68e86dee2c794722e12fffd072e22d49e8