Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a74e0c1bd88234…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 19:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f302cc56e91b773569244a9138c798d6 SHA-1: 5643dd4def0c977f3a64a18832efa16a068781f8 SHA-256: c7a74e0c1bd8823426fad8264d7a0cd32845ff500af3e34fad4b6895c9129387
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328a61b725e---zamevebujaj.pdf In PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/febaxexovetejujuvubufukiw.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/tewonikebojosidovuvikagun.pdfIn PDF document text
    • http://etre-belle.su/images/file/40998783450.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/31736911167.pdfIn PDF document text
    • http://agilesolutions.in/uploads/34109786840.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/bc8b408ce6a6bd09264035a9679f853b/52708119820.pdfIn PDF document text
    • https://ekransamara.ru/files/6378642013.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/210356043682.pdfIn PDF document text
    • http://esangsok.com/upfile/files/pewum.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/78392437624.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/folefonademugakifosogugil.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/84264499316.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/29202769417.pdfIn PDF document text
    • https://digireg.lu/upload/buganegisi.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/mufetiwal.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/kawepazuju.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/gowawise.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/loromokozofupabibigot.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/toxosofuwiniwidiwebezabo.pdfIn PDF document text
    • http://healthywithhart.com/res/file/40004798814.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/61076492424.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/zusawosabefaro.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/11354190250.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/52242553097.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/watamapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sms+home+appPDF 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_off0000b1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 10152 bytes
SHA-256: 0abbf6c3fd5fc889db5c729bb23eec81460605ad2a89bf96561e8edaf29f149c
font_01_sfnt_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 16180 bytes
SHA-256: 7764875f3f903a9d4bafd03910f3d639f20a8fea39052af00288eba1980cb2b4
font_02_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1