Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4e911d38531c93…

MALICIOUS

PDF

98.1 KB Created: 2021-09-14 13:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 833eb33db825898d8c6c5358ba79005a SHA-1: 43414c639400ae6d22527c2055e671b26b2339cc SHA-256: 4d4e911d38531c93b175e4bc2b6eef441366815437e4f371e0e40cdab9098056
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to disposable hosting or compromised WordPress uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://huntic.ru/uplcv?utm_term=how+to+transfer+to+sd+card+on+android PDF link annotation
    • http://grandp.ru/userfiles/file/10990405726.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/radovekixumorixapivar.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/xegapurenadigebanusesixe.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/27783210697.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/ramokawujejokoma.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/getugetiguxut.pdfIn PDF document text
    • http://dongphat.net/upload/files/risanoburovowuri.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/34721792243.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/nigafe.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/65149955337.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/negewekemapotezus.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613248241ecc0---nonozebimase.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161405a081d210---pupelitanuv.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/99671452411.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/50388644047.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ade5423d1---5221184456.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/83107084998.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-13-15-26-45-fbFmIum2.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/95547893639.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/lobixolokarusurowu.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/filuv.pdfIn PDF document text
    • http://camonetinternational.com/files/file/23593136321.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/dapufarofopu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6f84641acfa672c6f7c3746c552ed6ac/gawokuradogivobuboboxesu.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_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 10500 bytes
SHA-256: 3f800e22658c5e9d1045342bbe1e8833022fd8e2f36f38a2b80939229b223056
font_01_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 19176 bytes
SHA-256: 0cbeac8da09debc64abd0f0b97665b607e6db4043fb354186cc8175af180b01d
font_02_sfnt_off0001630a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1630A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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