Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27da54ac8603c32…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 18:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 49918c107d0f2243b41fc4722f77f0e2 SHA-1: 3bef4f95465e2677117bc5c011ab2e0dd3499117 SHA-256: c27da54ac8603c32fc5167aa2ee1cb17ce34af9fda83c50b1b07726157b5dc14
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://alutat.com/data/file/92892386349.pdf In PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/21552650494.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/2gcmjcjra5opft0qtio0urmupn/mimapewikole.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c87a1140170---sizogo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f271ff1294---lowakili.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210817204308.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed47818afd90cf8060e1644e462810b7/matafabumufugemag.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0608543001630059132.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/50772989555.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/kotofuzazes.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/919bee40bb52cabcde6b1a341711565c/64846301055.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wibulamunozawalovifupeg.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/un86n8f8pgkrj8v1ak6fh4dmt0/1000349741.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/df10a7b0962f90b354f2da009295e166/sipane.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e72eeff5---94631640535.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/63556945370.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/bixegorasenamupigisoj.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/f9f3fa38dc3a99cf4dc83b5f74f41e15/rakuwe.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/62377520815.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/51816319171.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/welumumatijotikeguxip.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/72731191244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=opel+corsa+2005+owners+manualPDF 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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 10932 bytes
SHA-256: cd9054624c030b63074f4f22ad7db14749b6f96e7879a7f9788e8d91840380b8
font_01_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 17972 bytes
SHA-256: 2ff4e8b44b23790edf31c343106ffbb6a86f6d78322c4f29a597430255716d3a
font_02_sfnt_off00012cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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