Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8261eb7556974a6…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 17:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df5f842a3ca25ead3ff6a254b4f49987 SHA-1: ed0a3f50c840fc158bc9a23e9af0ecab76e82b67 SHA-256: c8261eb7556974a6ce257cece8a9205e6c18aedf56fb9152e2814ab913f7f1f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate the PDF acts as a link farm, directing users to compromised websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bff9d36be---fiwazezemikasemus.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c40aada26---90320083587.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/timuza.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b10a4d3ee3c8b0c599feab7fb2967908/32979946973.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/momilupesif.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/86181427450.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/51102098939.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/54382210339.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/25412263837.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/kumugunim.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/62594091328.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c711ae77---wakimeforexatelusoviwaf.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/vebasozot.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/jurotorabovirezemiko.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da75d538ad---78064202136.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/wudapulosagirisogesim.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/21p79fd0q9of95gqu58utft6af/menuxutesujo.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/tisagited.pdfIn PDF document text
    • http://htwy.com/upload/file/fogomovokagakekojogavot.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/xujitetutetolu.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/divolijejukir.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/25321410277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fce+speaking+practice+tests+pdf+2017PDF 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_off0000b0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 17136 bytes
SHA-256: 573d4e0a04eed50974be8fae121af45acb91761acce4a364c545e711a45a7233
font_02_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 11044 bytes
SHA-256: 5a6a6b39aa1ea78d31a5f95656ab72c6558abcb6da79662d195b84e433733f87

Open this report in the interactive analyzer, or submit your own file for analysis.