Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f46f4e2584730c…

MALICIOUS

PDF

95.4 KB Created: 2021-09-05 17:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42095d0dd4b24f0f5144d052292faa59 SHA-1: bd7dac40b73dae302783a9dd72b7c12b22a1d465 SHA-256: 41f46f4e2584730cc65da207db0c82cae3ad099621bb83a8d8f425de11143106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to distribute malware or conduct phishing attacks. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://medvor.ru/uplcv?utm_term=parsing+techniques+2nd+pdf PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c03e5bd1f---sajosofixujazegafi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/68243641507.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/sutul.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/11904850594.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/51153585353.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92d0d0623---95857490463.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/22807324989.pdfIn PDF document text
    • http://soles2walk.cz/data/file/61470888827.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/jogenowuxisibusil.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/29924148513.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5dc1352783dff8c16bcf204c431b0a43/26888715598.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/vipulojokikipubez.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/latavutagaz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2ba5112a051d0521d82268559c847ba3/xegilufemoti.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/10391128300.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/sozufogirat.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/35512884039.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/s4j75u7n1enie7q3lh45dgm8e2/doloninom.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608372f7733cd---74719217786.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/59665105861.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/t21vcnqf9iqm7pjqm72sttksvt/30685285576.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/aacb74c9513ada416ce8625af72a8130/baluxodudugusurenedefefob.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/moludubunepabodupikisij.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_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12544 18692 bytes
SHA-256: 46341d82f1b80b803475dbf0081935572957e65eb9ae7d84e81fe9b0ccc35459
font_02_sfnt_off000156ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BA 11100 bytes
SHA-256: d5f75a4c845a049220121922f4b4d08a1a1d83f99dea497e5613e8a47b3e0cd4

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