Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56fb5a70751cac2…

MALICIOUS

PDF

87.3 KB Created: 2021-09-21 01:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fddc4bae0980b7eebc43ee0046afe97d SHA-1: 15ab9e03bdba9ce07e23fff90a52e7e4c0c2bc6d SHA-256: c56fb5a70751cac23b35744bf5af2d3701310e0f56226b4ada2aaed8cfb85cb0
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URLs, including links to compromised WordPress uploads and disposable hosting, suggests a phishing or malware distribution scheme. Notably, the file contains an instruction to disable security software, a critical indicator of malicious activity aimed at bypassing defenses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://chcial.ru/uplcv?utm_term=correct+spelling+of+quite PDF link annotation
    • http://dges.in/userfiles/file/55570134561.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133621da8f56---55410825640.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/67490273691.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/wibevinabumusupo.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/rakonekerebolanurobefot.pdfIn PDF document text
    • https://0900107678.com/upload/file/70127386871.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/7123070261.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/80078877762.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/lvkoh8iqfi60v7apqsd7alocf1/68913564284.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/64747569533.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/nixutowewizum.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/zinisurugi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/649b70bd4c6903a370fe39edf3f25f60/86346950256.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/simevabuniwurosude.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/omvijmklgn1pthhkrne4o3ijm6/berejizovu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/sebopelejapisom.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/90201079988.pdfIn PDF document text
    • https://pepsima.biz/files/file/46114115396.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/78850960443.pdfIn PDF document text
    • http://wohingltd.com/userfiles/fabejapazebufob.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613341b0b9a8b---47435269741.pdfIn PDF document text
    • http://shahgrp.com/uploads/nimowumalazef.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/964835135.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/71260575561.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_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 10768 bytes
SHA-256: bfb607def2c62924ebecf282355432651bbe5344f54ec4bb61fb3a399a5d24cd
font_01_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 18400 bytes
SHA-256: 1e05b7d0ef81d9d93547ebc092cd0959f3a30ed98cf4251f6ce9d2fa5b718a67
font_02_sfnt_off0001371d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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