Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e1f21b963ffea8…

MALICIOUS

PDF

74.6 KB Created: 2021-07-03 05:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cd1bfec6074fa0e774b41f2ccc6d3dc5 SHA-1: f9f270233636de146ac6056424aee8594ebd7d70 SHA-256: c3e1f21b963ffea8194cb608cfe8562e96cbf9fdcc6f9ae9614e68bc22a77f30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links on potentially compromised infrastructure supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ac455cef---55999563592.pdf In PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/89373590101.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/jvshfni4qbe07uf68rlkdptqfn/tilobena.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9bacfd54039a14754087d353bf74f3a9/jowilujuparibezoto.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3lr9bojvupuv2ujjr3kpn0k0g8/fiwanesovatokal.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4lde0644gag0chgr5cgibi4121/gipagorunexufiravogelulu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/13305401592.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1d691d2bc---58124838734.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db4a1c5667---geboxupo.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6241406b---43641285470.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dpvvkugiv18ig9pui2qi55q182/wupimaduvakepikive.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf34a4c266---tifaroteluwefapowedimazu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bd97f0e9e830119c86f031ad7dec48f1/30725595740.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/60341919437.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8fe91346fb7a0e48774205c6873e4f71/92290721310.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/sogoliwodosuruxewom.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/dabimivo.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb67999b81---88756153207.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd774bd18a3---botopinoxezuxojazur.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/vesoxixigibevexokasutovuk.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92ab7789c---30567279657.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/20767262735.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8b4cd0d8344b891ce311a0f87320cc44/73950414354.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9c1a551b---televodosesujet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+day+did+i+start+high+schoolPDF 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_off0000c227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 16360 bytes
SHA-256: 79f016692b380a7050f8de9e215f6e96148dfa3ad648f4befee3bb9cbb509bd0
font_02_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 10520 bytes
SHA-256: 0a956079616585fb29eddcf782da10d04129cadfddcbd7993b12bf26a293399d