Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b68d8f5abf932c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 02:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9608451dc1ec8c97ec2cfdd2a13fb739 SHA-1: 1fffec484831490ee292a303fdd5266a048cc1ba SHA-256: b8b68d8f5abf932c5c59a121ca3f4a2a3375aefd14f57deae38ff355db8223ad
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to lure victims to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://letdentalab.com/img/files/gasuxut.pdf In PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9277af6dc---fikufafujibexazajedoxowa.pdfIn PDF document text
    • http://santeh.md/img/files/tibapuxupox.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ff60d68e---gotijepawajurul.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/61789055040.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d48a19d17---sebipipivobepunoneza.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f590270731---42894481954.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/niragirevoxise.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/zutidafodigurojilab.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/9ff19b152ed0ceaec38327b9dfa436ca/75070644560.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/zexusidoguzuje.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e5a49354---fubopunez.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/36705103443.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/moboduk.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/69573526365.pdfIn PDF document text
    • http://regmac.net/userfiles/files/muzuwujam.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/malogudajamakofepiwikifa.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/39494714724.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bddb39cc45---11658658169.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/bovopivajipekosiputer.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/11577763681.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/fidupazibuwanap.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082371b1faa1---fuvinoxifiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=grade+2+math+worksheets+free+pdfPDF 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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 10856 bytes
SHA-256: 14fffc9638d597685de6a0626567924bdf03ec1d7485f6176077da2e12730092
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 17132 bytes
SHA-256: be7716c6a2cfcd3fa4bfd87b9b1a67eb64e8c1fdad43e39a4db75fc6649a4ff2
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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