Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b65826648d32a30…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 01:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 578685c182eccec8df27ce72f773dc6a SHA-1: 7d69e12390cee716dcb94b448cb60a64eef7388b SHA-256: 9b65826648d32a3039dfa05f341a87d0e09ad47445a30ffe3753e9a470a56196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites, likely for downloading further payloads or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://beamstraffic.com/amb/userfiles/file/tonigenesazewirom.pdf In PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/19146596121.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/vigebegisaget.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/doxalizezajowizibule.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/segerenaxolega.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/sefuliwenijamexunof.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ruzurojur.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366e0e8910a---jutozenegezedavaza.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d8ab3e5a---98864826513.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/14997427380.pdfIn PDF document text
    • http://venkateshservices.com/uploads/55707451083.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/zanovixuzetilufodi.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/mipiluwupix.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/97061059758.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/60550117724.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/jubimes.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/zagik.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cvuv4d7v5sg4fpdmtk5jtq9l74/15336097221.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_A801029983E3F161.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/jifososolusaxukasamonaz.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/ritimutonifalujosa.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zovilirilekuw.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/43907712801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=adobe+photoshop+2019+crackPDF 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_off0000b2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A3 11044 bytes
SHA-256: 1726d9e4e587e7e1d23f99c20d96f99dcc00efd10102243fe934549bce3ecbae
font_01_sfnt_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 15736 bytes
SHA-256: 001cbd120af643a154a696e4b56ffb1ab17b42b48eaa5af54809e3c970b7b4c6
font_02_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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