Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7eda4bde99ae623…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 00:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3cb94f6dc6d1cce5756228a8313152a2 SHA-1: dfe1c34709f1919146b8851c042f48d87254efef SHA-256: b7eda4bde99ae6232708fc2cedc99b74e7aab81580dc5e6108d9b40c417ec02a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF-specific heuristics related to URI and link farms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=swamp+attack+2+download PDF link annotation
    • http://hoteldanang.com/uploads/images/files/tadelaxusiwokof.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/14551114825.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcfc4878da---kufapumim.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lijafalo.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/12090851472.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/sumitiladasoses.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/81176380147.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/276f2a7674237e2fd9b2dcb73ffc3f07/89670725206.pdfIn PDF document text
    • http://sswjeans.com/files/54108859508.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/pikojujuroperol.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/73180342610.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613905f71af9e---saborunewibavubitixakoz.pdfIn PDF document text
    • http://yongqingtech.com/d/files/61746224335.pdfIn PDF document text
    • http://neteyes.eu/editor_up/fevudirodizadorutuwov.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210911052018.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/66752419846.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/8658732749.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/51834368989.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/femutitaxavamawomizuwekaw.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/xafum.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/sozutifuvexa.pdfIn PDF document text
    • https://kaisar168.com/contents/files/59152891869.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/80566811392.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/fisositojogefijubisa.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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 10556 bytes
SHA-256: b2d28299e9c8c2b198d8c867bd9aa7538c44664e176207e68c6a4e5a8ab09836
font_01_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 18776 bytes
SHA-256: 562c4c4f0ae0a9f93e6f6e81d9ce3df1f1d24ca5b790c3f31b85a7e7fef3fdfd
font_02_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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