Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0c00ac3dc9809f…

MALICIOUS

PDF

95.8 KB Created: 2021-09-05 07:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba34eaa5b90fe6b8ce7e62414d8c1123 SHA-1: 226634b65fc40398c6bcc3fde29c81e1c7915d80 SHA-256: df0c00ac3dc9809fd3ac77c2f00c0250ccbd61b7c5a914cfec34f0ded5a0a13e
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable hosting sites, indicating an attempt to obscure the ultimate destination and evade detection. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/36562876676.pdf In PDF document text
    • http://dui-antidote.net/images/userfiles/file/51187351073.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/95q6a1oq7oor3i1pjiqeos23ia/lijamomul.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/56437849866.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c691b0b5320d751ecf6851397a86b11d/79593639693.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/75306282666.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jovipigugikuzuxi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbb3683df---27287528730.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/pujipegevogo.pdfIn PDF document text
    • http://www.ezmoving.com/file/faditomasori.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/roketopira.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/71997881811.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xixesineli.pdfIn PDF document text
    • https://orrizon.ru/images/file/vadelovosa.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/13480602621.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/58880698872.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/18202825322.pdfIn PDF document text
    • http://torgoborud.org/images/file/55464292721.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/leraji.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/j4f6n1m1bku05kr1sjkqk1n2sn/18732164213.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/3641415678.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/pirolipasi.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/budenijafotaj.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/rinigiwarefiro.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/tunovov.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/82909004810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=reactive+power+compensation+using+capacitor+banks+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_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 18628 bytes
SHA-256: 241215ecd0387ba7584754361e784604c089520fa0cbe5b0a63f46be5f00d18c
font_02_sfnt_off0001560b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1560B 11448 bytes
SHA-256: 2fbb9c2fbc3cc967787ee3787879b1f3985b1b475e5ace41e4f5a09ec83f0329

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