Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e3bc3a079b4b9c…

MALICIOUS

PDF

93.9 KB Created: 2021-09-03 05:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0a92d4c468dd6b30b77c06989456fde SHA-1: 1c9bc07645152cd1af59cbb8712dd17795f966ef SHA-256: 26e3bc3a079b4b9c90b30ad3eeef7d656f7571c6583f149851f63bff0b5e14f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=traffic+signal+chart+pdf+in+english PDF link annotation
    • https://kurtoglumob.com/upload/file/dafurolisul.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/jarijofokoxak.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/fidonarabafe.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62edcd526---pexegufupibewewogigejo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94d0e6c7a---refivebug.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e954aee37---84468519488.pdfIn PDF document text
    • http://distributoram.com/files/file/jitizel.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/45477458154.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607200868dec3---fisonirijeketenukurewi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4fbe4166a---vetosoto.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/1e26943fb2d833aa431226f1fbb9fe69/76009398765.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b0b5f48fef9e6fb38dc93a3a18cee4d0/29539230673.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/xijenixanubuxuzosulugamom.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/93b992ef376a7fb3cfb08c5de60aa360/negonawokelos.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/68425491433.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/dibibubapuwikali.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/74372790370.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161172dc116bfb---buwotuvejofopufudejifefin.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/dikebeb.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9cb747e1319a61a147ba4b97ca7d7323/pegawebilajov.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/18687711715.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f377a9d949---11506029711.pdfIn 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://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_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10740 bytes
SHA-256: c561b9818948f92b1082d62432a8bfbf131477dd89e85257a8ac5e2894941f80
font_01_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 19528 bytes
SHA-256: 71a585e493794bc8c7651f09ba4fbe05b5b954c9f355a3038d9725237136635f
font_02_sfnt_off00015222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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