Malicious PDF — malware analysis report

Static analysis result for SHA-256 9663fe60245da27a…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 04:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 97b6496ff608de5cad063e7639931be3 SHA-1: 7e08cd3b8c881339404e7a46569562bb4c66705d SHA-256: 9663fe60245da27a551639a71911e3f74d718f22a18be0c7fd84e8db67414d0a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://appli-veolia.net/ckfinder/userfiles/files/migejurer.pdf In PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/78099432789.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fowuvinojavamo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e52555666---13745935797.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/65398383979.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d3ebdf9356906c06dbc4c5126e23ea9a/65632358174.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bufusomajuvetigiwepup.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8f574e8648a3538036aa940e2a981a6e/dadutufaxut.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/toked.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/89749081860.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/befuk.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/15093166171.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/67607120253.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/7106633870.pdfIn PDF document text
    • http://byecook.com/ckupload/files/joxilub.pdfIn PDF document text
    • https://online-wums.com/files/files/gizesitixivew.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/sivulupelulivab.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/29007849740.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/zunura.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/11709038003.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/56484652500.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/68084551840.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/tisatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=god+is+the+only+god+bible+versePDF 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_off0000ae84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE84 15364 bytes
SHA-256: 7b666722276f1ab4faf461769ed89204cc71984be704ba805515f5655bda9af9
font_01_sfnt_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 10724 bytes
SHA-256: 73a46479beee67f2113cc521714959b40611a78146f9f7ef87876c72926a47c7
font_02_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1