Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b135c0b647a5b93…

MALICIOUS

PDF

85.3 KB Created: 2021-08-18 06:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1726250bad52228a78db311e5803b25 SHA-1: 9a32b686cd31c0298f4eb285eac1965280d1ded9 SHA-256: 4b135c0b647a5b93462b8b0f2dc3b4ccde8fc4171a66bfff997686be74e32268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially harmful content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ajivikafinance.com/userfiles/file/gozisurabupire.pdf In PDF document text
    • http://tokyosushilohaus.com/uploads/files/61784508023.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/93407122750.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160977dd91b14e---72696049708.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/nulemufowetu.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/99795867899.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/40588bdfb3bfc581e0219f29919cd3e6/xoxow.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/38856b51feb88fe837f1d9981faa9125/67865735420.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c288a41488e---89924101488.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/babufizenumozevewex.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/56689411641.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774def62a2e---mepolobifovojata.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b49249ceee---17895888050.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/tolapenulizoxopewobenu.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/mubofixenujolefij.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///waboz.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107211010229049.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/87423066803.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/pidumazokaviwipewegodisi.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/dufuzawerafisute.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099d123842dd---kokukovobodoni.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/43ce9a6d462a21da26be9125f927fdcb/21659632764.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be86f32b5fe---96985379924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+are+angel+names+in+the+biblePDF 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_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 16968 bytes
SHA-256: 6a2eb80ca007d99ec367081dc1c5bbbc118bf036135d8c44e5b619ccbf9e5014
font_01_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 10568 bytes
SHA-256: 106c810526faf879d9612559e79f509abf36be7570228fc158a6f16e6d77d745
font_02_sfnt_off00012ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1