Malicious PDF — malware analysis report

Static analysis result for SHA-256 2201f426e3cf50a2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 19:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8e743e429e5724c1d3f3fc7a37661fd4 SHA-1: 9ef22e528b2aa5f686a0c9b9bd938f57d4bc8344 SHA-256: 2201f426e3cf50a2153152037779b489f7096fbeec47ee7db080526ad86cc99b
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. This suggests the document's primary purpose is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9327

Heuristics 5

  • 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
  • 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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/baebd3d01e328dc4d7a11f7b73049060/55971746548.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0abbea8d---fadenetevi.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/42832987338.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/rizigowidonigijob.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/67476667210.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dofuworaf.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/735189117ae99cb79e4882065c771378/79886342406.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161058d29de22a---wenituvem.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/43670604783.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/nejumivuzapurini.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/13145834741.pdfIn PDF document text
    • http://expresskaliski.info/file/6281449676.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/39077961794.pdfIn PDF document text
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/74037917795.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/fuzufuneriju.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba861e613---vibixodarafekiniti.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/pipumalixuzorude.pdfIn PDF document text
    • http://eucenje.ess.hr/media/files/16935600160.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b710d556ae2---xoresokagawepevexufado.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4fdd2cee---zujaba.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf29f67113---dekofetelira.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/97000361384.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2sb725hgqbt846dfln4k66sn5h/josos.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b315dd29d---gorigekusoled.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/15560355209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=stock+valuation+examples+pdfPDF link annotation
    • 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_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 18688 bytes
SHA-256: dac193c3851fe2677d00d9ddaa879682caafc33e979d0832187c941a90204450
font_01_sfnt_off000126ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 11116 bytes
SHA-256: 0ecb26f7c441a227fcaaf70b85aa22df35c731f0d9a4961ba7a7e196fb947749