Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d3795fc9367472…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 15:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4ee996a1ec111a4235c86a10900dd99 SHA-1: 49c5ff467ee99a7017affb71c4990415ce7dbec4 SHA-256: d3d3795fc936747221c455ad2d2d25dbb78397361bdb707d501d8e12a10aab75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://strandedtattoo.net/file/7684426491.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd75c98ff---pinapozazoja.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/xubexukuxexepoginiwe.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202142916176697.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210625093521.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210714034844_jiojxx.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/92539637550.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d494a2a2e---tibazotilijebodiwagenika.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/rebipubodub.pdfIn PDF document text
    • https://aitalk.vn/upload/files/40185022780.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cc9e7b4fc---fiburatesegukukajaj.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fjm3l88438tfq1bes2mtnhf02/13266011270.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/nuaqshmif71ne20ccg4e0v8t14/surizimeladafanix.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c4b8e5b3---6306940802.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb988bbc67---nixujojaw.pdfIn PDF document text
    • https://ultralloy.net/upload/files/62646691317.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/gotipitotenotuzot.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f284f282118dbdba57b4a6fa3dfc1cf3/99660439962.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/sununipegofazarom.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40aef41b16---98570782179.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210817160902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=more+powerful+vocabulary+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8364b614c---ranes.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_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 10648 bytes
SHA-256: 2d17091f09930ce0935f7a435cade4305a9951480b6fcadd3abed428f0b35b60
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16832 bytes
SHA-256: 70b11af5b7c15c6caf11ae9e0b7dba86ad37951e071c9e18ff35d1ca0c878eb8
font_02_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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