Malicious PDF — malware analysis report

Static analysis result for SHA-256 48eb44635ac12575…

MALICIOUS

PDF

98.9 KB Created: 2021-08-26 00:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14d261c466f7ae6772d578c1024b010c SHA-1: c5663698206f81fcc0467e818f90efc3d4939f14 SHA-256: 48eb44635ac125750b8ce3eaaeafe165c0438cb45312b1bf1a4c589ee2f2f6cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inwebjor.ru/uplcv?utm_term=human+physiology+book+in+bengali+pdf PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef27d3e90---64531049178.pdfIn PDF document text
    • http://aquatherm-graz.at/files/27195979650.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/93037594778.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/47173313018.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/dikekumadulufuwapuk.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42993295612.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vaxemejurumofakoloxo.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/kinubujavigefijujipam.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0919727b8---kidasiza.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/59441332265.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff792b3d8---25330707244.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/japunip.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d91b1cdeab2835edc3f7e0997caccfde/tewinugabidulapuxotes.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/24580789249.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094316f0467b---26723435801.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6cho5dpf74uac2t9jm677b1lk6/renix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096577429c1e---5778121089.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sekefafexuretevopotiwire.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610a818d9061c---gojijomemunonowanuz.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/94951879094.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080788d3be69---51444622688.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2a25e29c7f169da4e5447c08bae0dc15/menenubazotukuvu.pdfIn PDF document text
    • https://ottopianos.nl/files/mojodilapewujitanoxaw.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7667e1cc1---monudifebemukokitobi.pdfIn PDF document text
    • http://araonline.hu/uploads/file/nawudofefisivazerilu.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_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 11184 bytes
SHA-256: 96e8900884e26d6b4c1f22e4986bb1d72f96cdd6118b4858e9db7ec4684fe9dc
font_01_sfnt_off00013917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 17040 bytes
SHA-256: 80e55bea55b0968fb2552e84689c557c3d08175f897dc36d31d0703aefd1f7e4
font_02_sfnt_off00016598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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