Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b27b8a037cb5ce…

MALICIOUS

PDF

89.0 KB Created: 2021-07-05 03:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5ad0234b600221ae852a5f0504650422 SHA-1: aa2765d6017d081f645b2c56f14a690e1547e5c7 SHA-256: 05b27b8a037cb5cea996f8ff28bd9bab5ea74dfcf258bcee539f2cc7d3437395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://catamma.ru/uplcv?utm_term=contest+of+champions+crystals PDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1cab620a---74897167172.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ef7226191c02015daf91921d91dcb633/zukejumokater.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xesutagixanazija.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/tozuvagexu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qv86u1slcl9dei5s026rf9c2s3/bunazimuzajudusi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073167c9806b---paririlezibogakiz.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609403c90154e---murorovujufo.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/vavipuxovunu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d3225c2a172ae76d3d06513e67d452b2/93628664959.pdfIn PDF document text
    • https://ecoretras.com/file/xidopipedarebajelepalu.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210531184704.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/90308901750.pdfIn PDF document text
    • http://mega.kz/media/upload/files/rojasepiwumoza.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/58f656d0f85774072f72214cb44b06dd/47127136943.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/lozovot.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950e3113338---49798499536.pdfIn PDF document text
    • http://minerva-collection.net/files/files/famaronidosaxi.pdfIn PDF document text
    • http://huiking.cn/uploads/file/200958328743.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/89722930575.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cf3b6ce650ab1d7a29d1f9c3484eb8cf/23791090051.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c982a15f1---3033041418.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_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 16856 bytes
SHA-256: 650d3b47ba160d84ef78ad96f91231b817771257beccc1e620c98f677562f0fe
font_01_sfnt_off000125f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 10892 bytes
SHA-256: c33c748fe701e22c5cd35c310f853514ef6cec71c5f0617b102409df83d90225
font_02_sfnt_off00013f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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