Malicious PDF — malware analysis report

Static analysis result for SHA-256 098ab150c85ac6f6…

MALICIOUS

PDF

77.7 KB Created: 2021-08-08 21:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da5f394b497194bcadfac959bca082bb SHA-1: 467e4ab9f9329148e1108b9548f0fb197034ab1f SHA-256: 098ab150c85ac6f67a41171daed5c06eab244db6e34b4e336c034a055bd84290
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, characteristic of a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608990b00ffec---boniwogiletadep.pdf In PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/kapizobufuzupemufosivo.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/dutubume.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff134552b2---puvitubasopigan.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/95826132615.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kavexuwekilunimafagoreb.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/17669515938.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161077b69d0c9c---34078733400.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/33452169625.pdfIn PDF document text
    • http://yuha.be/_files/file/99292333342.pdfIn PDF document text
    • http://www.asslar.de/downloads/xinarijamurojawupigi.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/46985970678.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c0f5be06---68426038981.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a477e5913b1---24080161952.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/16373191498.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a5f70c6fdb8f112859b55e48b937e0f5/34110916236.pdfIn PDF document text
    • http://sy-smile.com/upload/files/95103893383.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/30390719839.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/3958279534.pdfIn PDF document text
    • http://indemo.pl/Image/files/fasexubesameradonifejej.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb923688e8---botavoka.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f608cd3926---93840395202.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wabopades.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b1ae8610---gavegovelavelimuxuviver.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+de+problemas+de+multiplicacion+para+quinto+grado+de+primariaPDF 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_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 11356 bytes
SHA-256: abed11ff3dc6568630cb9a95184a06a58bb246ea54efa0d4cf5222207b54bb0d
font_01_sfnt_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 17868 bytes
SHA-256: c6da2fba75ace8e9ffbce93acc6c0da6031261a4aa45aa0a35597caf472d7fd5
font_02_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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