Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c225041283d8ae…

MALICIOUS

PDF

115.1 KB Created: 2021-07-22 06:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abb31eb3040fe433026cbb7ae3877bd8 SHA-1: 6d0f04e92974ec2e0c1e41c8ec49f3ffb87367ed SHA-256: 51c225041283d8ae46505838ac6ddf8fbc83607cf63f57b4935913333f5bcbca
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan signature. Static analysis revealed it functions as a link farm, directing users to multiple disposable hosting domains, many of which are compromised WordPress installations. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.2353

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://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/hnn0h1u7nk6lnekuob4l4daars/zasesugesuzovobinawi.pdf In PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210627_9CDCF62D339335A9.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/77321074540.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0fce8593---10567072820.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1adc9bcef3---59387797803.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/93554298ee79be536e336deeb3e1846c/sadexufafeg.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844cfba8c9f---88211630749.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/71825520444.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9aenbnbulhr65q0cbp872jia43/87384314288.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirekosozadojugobidigifo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b8440ff90---jugeluxatuso.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160833a1966f56---pizepabejiduboj.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/64962832190.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/2bac7932f7b08aca31b7daad120b5ea5/jazazakejinotul.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160706ea8667fe---42472642031.pdfIn PDF document text
    • https://mauspro.net/upload/files/22364796582.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/majuruxubuwalirebinanib.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/1afcdad670414d4f1ca01f1b9abc0290/tapopasi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ada839899434154b093281d5caac65fd/tuzotizutofug.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4kf615a345rhv56rlqevqagfaj/durimu.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/9c901mqi7o7k0o860ut0b43l33/fubozudotijewupege.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff39c8e0f---zefaxakif.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/rokomagemevovil.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/bipotexowefaxawipid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=10+singular+and+plural+wordsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A24C 10600 bytes
SHA-256: 394d1f0cec55b8dfc4ec00df357404a2d85817cafca72408d293e6d8dda108e7