Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f47203632e0b3b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 18:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cee01a949cba18f1aec650201b1c3980 SHA-1: 13ba6c69447cf386db9e80a60e2df9438e874a33 SHA-256: 41f47203632e0b3b961a3121225ba426c1ccae50cd86f062ce9f218797d99b5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xfswchem.com/upload/files/modosudigezile.pdf In PDF document text
    • https://majubesar.net/contents/files/xajukibotufujevuz.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/96547152488.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/gofutizepufopudisujo.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/lexifizujupi.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-7/20210907083849670153.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/wuvutewobutet.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4f712cab---55403171057.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/kifazijubibutulumel.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/gopum.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/e0ngkmr3lgl67adtbl5re8ut02/78437116905.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/24296695593.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_2E56161C25136190.pdfIn PDF document text
    • http://skolky.info/foto/images/file/zuvov.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/80326947818.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/vokogizanude.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613436281e0c1---topidebinudav.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5e91e9057ce4617a77227f72f56f22bc/90199783053.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ec99fcb76436f0cc56a155f527cb0c97/4950787000.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/96909655784.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/19448763482.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/5976371175.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/rizag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fox+fm+download+for+androidPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/mokitadezogox.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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 10284 bytes
SHA-256: 1a4f5458de64fca445cde69fb2f8d87508fec91da1900265d972c0ad34659bed
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 18508 bytes
SHA-256: 6c2a5607427c6e856028c3bd87ab296b637357aba982bf3f4cd4d6814bf9f2d9

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