Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f49e2189e2ce1c…

MALICIOUS

PDF

91.1 KB Created: 2021-08-08 23:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e207ab311ed084d61a1563b78f77ed66 SHA-1: c0e5f10055bba270999e17488e79dd28ca27d168 SHA-256: f4f49e2189e2ce1ccab3b7a9da28d680dbbe6daabed8b5545148422dcf335b4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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
  • 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://medvor.ru/uplcv?utm_term=carrier+air+conditioning+manual+pdf PDF link annotation
    • https://tennis-samara.ru/img/file/mozun.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/dfb2267aabd0c03e4c5c679e02f860d2/43124365200.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/fawukexedokaratufa.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/45883129404.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0adccafffe60a703ce0ce1d3efb9edbf/kalejiwexa.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/23642389575.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/26bc7182e0793c9a78798f0dcaafa074/73012379859.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/tewalufesizisusoroxa.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/tumit.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/cmom2qn042kmlsji4l4jr2dpj6/6825609716.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5959fea3ea8850fc730696f2125e1e70/56218313698.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccfe65a796---43356526951.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/9310894403.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/sinivaximojox.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/xugufabotilodolapiw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/746e9e5237ee79c0b186774d0d4bb70b/6033285422.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/106b1995d6a943e5a0272f636a82a553/mewavikesozapafuvopudexuk.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c86e6d9a---33727782673.pdfIn PDF document text
    • http://heureka-cz.eu/files/zupepotixivo.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/56309310317.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7616cdbd---38052349020.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/308047924.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/88382700597.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609585bc2cfef---gaxufiz.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/gikebugefasegugugepuwaf.pdfIn PDF document text
    • 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_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 17548 bytes
SHA-256: 43b85aa30d03c5b27bc254ec14e4d1377ebae8e42a3ff5ba9d395a8adf265d89
font_01_sfnt_off00012c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 10928 bytes
SHA-256: 86ccb5824a3240a52b01c0a487befecdee8c0d2ea3330e8bfaf4e4d7fe0077d9
font_02_sfnt_off00014548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1