Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24627b64e272049…

MALICIOUS

PDF

71.5 KB Created: 2021-09-11 11:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a643a66c2a562f97dd158ac8aa98da72 SHA-1: 269d1f30a5fa14602c75c4c82d55351b43b5d3c9 SHA-256: b24627b64e272049e4db9c5f9a95c9ecc673eeec5332c1e3ac6dd914670ae35e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/32820913974.pdf In PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/dezisugodikazinumesesu.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/vizopubejuvubinured.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210905165839.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/651ff052db473483bf027641c5ca7f3d/38224811005.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/49389323087.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uhp0b4dnjbjl9aciv3nlndnann/jujujujufo.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/lomerimovose.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/6405285495.pdfIn PDF document text
    • https://questyme.com/userfiles/file/55974323651.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/zigoregaxezufogokapune.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/janorulagimidener.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/61905782126.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/19026395682.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/83731123870.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/82283625828.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/lolarezufuragivemexututib.pdfIn PDF document text
    • https://renteci.com/imagens/file/11144827863.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/70333500194.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/tuwizid.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/06clmroden175hfit04pj2te0c/sogitawejexu.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/nokogabeseluguwupow.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/akdalu6fioglhhbppj1inr09mb/23914598363.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f313a2b7b5---52055090172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=descargar+google+drive+apkPDF 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_off0000b749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB749 10648 bytes
SHA-256: 4225ac3c6479a41d1c50734779ebaa338f6af7eeddfadb02500b540180c7da40
font_01_sfnt_off0000cf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF94 16084 bytes
SHA-256: b4e61904bf06d8c0956952723202742ec0abfa3c86c3fe76496960f13aad5635
font_02_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1