Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3d0b8adfec75b5…

MALICIOUS

PDF

91.3 KB Created: 2021-08-05 02:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d108277a43e643d0398bca8c1aba930 SHA-1: 1f4a282eb555919eeaed476ac6d0e31df2a26d0b SHA-256: ec3d0b8adfec75b598f93caf11b7d5f53e9af6b24bf51df2cee74f2ad91d82b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are hosted on disposable or potentially compromised domains, suggesting a link farm designed for phishing or malware distribution. The presence of the 'SE_INVOICE_LURE' heuristic indicates the document's content is likely designed to trick users into clicking these links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://behagi.eus/files/galeria/files/72623674478.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e3553a913---leposanilopaxaru.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075c46deedf8---87097591625.pdfIn PDF document text
    • http://idroter.org/userfiles/files/13296782239.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2212996f77---32118199190.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/1022024337.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/gixoxitowi.pdfIn PDF document text
    • http://www.centralperdana.com/file/99821251029.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a77273ae---85499230840.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7fc27ea3---43803936145.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/14f6558e3d0a3b846c130854742b2e03/4248689240.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/20486410020.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/40687674107.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/32354592097.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/224a128a9d12600fc408ed38918d59a5/7283657792.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/80848993475.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/640501976.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/mimeferewaresuzema.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/975fc2a19723735609ce027f30e893a8/74997299515.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160963e860551d---vinivi.pdfIn PDF document text
    • http://netshopnepal.com/userfiles/file/87001487957.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/81820020553.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/gelamujameridazesuzebimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+games+to+win+real+money+on+paypalPDF 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_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10848 bytes
SHA-256: 9e3f4173e1cc470ac16f595679528673b5dae593ab6988a1895b2ce64fa3c9a3
font_01_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 18716 bytes
SHA-256: b9fe236eca3ea8b5cf7df932f62829b55a70efb9e4ab13d5da07747df2d7cfe1
font_02_sfnt_off00014693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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