Malicious PDF — malware analysis report

Static analysis result for SHA-256 6587182b1601c9fa…

MALICIOUS

PDF

101.6 KB Created: 2021-09-05 09:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 876a4a80a5ecc139d932f2c29a43eb0b SHA-1: 2bfcdbd649f7be65ab90092a3e50a6051e4f1375 SHA-256: 6587182b1601c9fa4371eaa67cb67fac4a061469fcb71844a494cbe3be4aec2c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/c234ac2c749ecd530aa47f61798bf55a/vokugupomomivu.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102c189cd99a---kubugabuk.pdfIn PDF document text
    • http://fedime.org/imagenes/4383088512.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210905043521356403mponjb61h4oc.pdfIn PDF document text
    • http://trevorhannant.com/zazesofiketipavupidumevu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2e4b61454d7701d89abf17f1d6c16b4b/jixugomugebufavitobak.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/76691235317.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/24047475744.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021081904205917.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf675ac0d7---majolap.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/171814b430d43f81e07f7bcfd223ccb1/paranolezivaxepoja.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/06ebef5caeb005b147658a4ffbe9c731/83575032974.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/tatozupuwosinidopeweguno.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/27959253687.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c88df442---55577665786.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e982ff53e56---22319007211.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/vemixuwuxedakip.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/tinurojumagenip.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/muzifosa.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/67205685085.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/nemojin.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099e705ca692---koradibapajonorikapofub.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210804090152.pdfIn PDF document text
    • http://vejwun.cz/images/vuvavebomerazowagawub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=morse+potential+energy+curve+pdfPDF 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_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 21636 bytes
SHA-256: bb71422d307e1fff7396c5a5e98b0ce1bf3a76ea7a8b9ed5d9cc9ac6f8fc85ce
font_01_sfnt_off0001569d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB4 11068 bytes
SHA-256: e7076a4a0b71e053658d3a3876c274a61c27308cf335f893d17d00f2328e47c4

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