Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42b9beb51e161ab…

MALICIOUS

PDF

87.3 KB Created: 2021-08-14 04:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da4f36fe0d5499a83e3c30216dc069e9 SHA-1: 34eaa6da8267756a04d3d8e8f6893da794191cff SHA-256: f42b9beb51e161ab9fc4fbb2952b5a4faa39d6cf31203b7b4fe49613149a2083
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent, likely to redirect users to phishing sites or to manipulate search engine rankings. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through malicious links within the document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3298

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=zte+modem%2Fdongle+unlock+code+calculator+%2816+digit%29+online+free PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adb61c429a9---nukisegegeziwowova.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/61c1d54d32c3eaaf3f232c2a1848ff94/nukuverofatobijemokejebe.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/1859550690.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/kgmjdi3aun02rtooqoau48hht2/18704035028.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/r29r7oo31grb2iu8p6b2scg4t6/39224219678.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf45e001b6f---25084261607.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/junofojibewononek.pdfIn PDF document text
    • http://geose.ru/userfiles/file/27779416710.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc7d94da1---30647529492.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/48862935660.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/78123784052.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/fewedupu.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/rarezi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ef13491af97327d92303356b40ef1c1c/50101620118.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/kigewujogotixedijawas.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7b5c5ab83ba6c6ac2227e72fc1f0ea78/vobowupile.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/18190724490.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160854bee4a33e---4636358878.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/77423334042.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/10933643383.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/51194237094.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/nokaredimenelo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abd751e6dfd---pojujuzuxisomatup.pdfIn 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_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 11216 bytes
SHA-256: 8892dafbc9c2dcd2b4984d70cf21a2de6c29414328d13bc8183b41d761940029
font_01_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 19140 bytes
SHA-256: 0948650b70bf249003a26d6d2595e9f73e99e1abb98405e8bb5b5c649736e6a2
font_02_sfnt_off0001486b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1