Malicious PDF — malware analysis report

Static analysis result for SHA-256 019e3305bf34d187…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 12:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9dfdf606742a6f8eed7d655cc1456a71 SHA-1: b24eebc101ac1f76ef5e76511129ba645e367a3f SHA-256: 019e3305bf34d187318db4c682b796808c0129721349e3d3f72893599eaa5d2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=how+to+make+photo+folders+on+android PDF link annotation
    • http://faizleathergloves.com/userfiles/files/65638661651.pdfIn PDF document text
    • http://bastola.org/userfiles/file/41914136481.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146e83630588---zafoxuvejabetafamig.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/91lqc807qo7ehbduo9esjc57ht/vinutita.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/waradatogukogowamusetojaz.pdfIn PDF document text
    • https://krossi.ru/images/content/files/xagemejugupufi.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/suwugadozeperuge.pdfIn PDF document text
    • https://razredna-nastava.net/files/39938456654.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/67305402750.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/xumusegedegiredido.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/44919003736.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/zexazuvixanadobumigev.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/19267802313.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/kilemuretopikij.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa0a702edd---dalezigapido.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4fuh0h0emplur0nfks19lkqmoq/suduwoxoletasofamufi.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/zajinipawebev.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b67e114bc1---40835501028.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/lekebagovezurodu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sawasejibi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6b4d05df85279221ff1c1aab2a5f62b2/41859926233.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/90074364163.pdfIn PDF document text
    • https://ntc-container.com/upload/files/gesonib.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0da939bd0---devijazesiliza.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_off0000bff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF3 10932 bytes
SHA-256: a95f74535510c620543112aa3f3e9ecce3aa8623e287d5ee1f688351a56f9adf
font_01_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16572 bytes
SHA-256: 64b9f8b9339d295b1cee99158a39d6fda5a7f6b542da6f95b3ab1771092e7787

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