Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce53f80b4ff1aec…

MALICIOUS

PDF

83.7 KB Created: 2021-05-07 01:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a3bbaeea19d19182e7cd7417f2545890 SHA-1: 2d183443ed4e3e82c6f560aef2986be50efac0d6 SHA-256: 1ce53f80b4ff1aec4fdd4fefccbdee12356cf0d962942c16c09a307f75a6baae
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=certificate+template+for+indesign PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f726d8645b---fipesadigex.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/ab7373873ad43ff8be7f104d888f4b15/73490594988.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607df65d6ab62---rafejegudabebe.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608863f5d5b62---muderitudivepudelekapad.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ab15714c8---mojufanuvedosijowumopit.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb9fa2b51---dupevu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/sgj616muopisjld2hmb3h9td5p/20884674136.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160943d1b3ee47---42587016392.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/9758397669.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607023c9f1130---22914140334.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b3c35cb6---punozasanezo.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/belanog.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075a306a9912---puluwubogezifuxuxu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607730dc8183e---95111601779.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/kipewekejovivasi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d93c245ed17c72de1528e522b34a6ca0/18455802752.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/84682395944.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/594sbueaeu3ojv2ktgd0kfo5kj/bomed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 5380 bytes
SHA-256: bfd20b19a69ef57c0d801d833eceb13ca4734b887e2b802d0e2d5dba1973e4c1
font_01_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 11044 bytes
SHA-256: d57759447e30d23a226a2fc9295f90ee12cfc8f6a3c58a9f5d873163a61c2b58

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