Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb3923933cc1bf9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 05:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 454cc5f570c9cfcd07e8a8c3f5e6de7d SHA-1: 796fbb2f426b567e54f09aed11f987171dbe8a2c SHA-256: bbb3923933cc1bf9d7257d0f4512611f15bbc4ae4b5c08486d8c0df89b54951a
164 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 or redirecting users. The numerous external URIs, many pointing to disposable hosting and compromised CMS uploads, form a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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.
  • 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://danfort.lv/userfiles/file/43379569993.pdf In PDF document text
    • http://rialta.ie/userfiles/files/dakipojilixezezebud.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9fbaceda94fdf2049fb89b24d484d40b/gabab.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/noluron.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/357fa09bc18cfd55fdd4824fba999dc4/todotekubegawolilijadax.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jkjj5qc6tlgitl9paj6afsa2nb/tazonutawiwelufitudub.pdfIn PDF document text
    • http://spakimthi.com/upload/files/derolitatowikikukik.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/dovikiwev.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/54734901954.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/kuparolazopujasolokuzeg.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/lofedifagule.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/giwabusumuta.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/sexabemoxesovikumefidupa.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/26774415.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/zamam.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/75666056213.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410d9dc7a33---boberapitidoru.pdfIn PDF document text
    • http://koala-al.com/d/files/xoxoxuzaripirejojilib.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614406a3a3c94---83195186177.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/12676296986.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/50869885201.pdfIn PDF document text
    • https://hiroyoung.com/data/files/gapibomobuwagidin.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210902_30DC3FA5EE4F3D89.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+android+network+toolkitPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 17644 bytes
SHA-256: c17ecb4fbc610792d125b977d1249f9219851a4d56882227c2865c990bbbef35
font_01_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 17768 bytes
SHA-256: 1057997056848f5aa3d9562e63fff9eb81698e1e8d295d480557698b433d5d60
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000129f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 10316 bytes
SHA-256: 7301ea331c269c3b1afe6cfdc23916d7f216b9949b1c1725b7c060024081c401

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