Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10041e4854b3fb1…

MALICIOUS

PDF

87.1 KB Created: 2021-08-17 01:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c6d48a1ffbfa172f30bf8b735ef1c7f SHA-1: 8fec5b3d5ec4fa70d1d29473e80046d3683559ba SHA-256: e10041e4854b3fb1b869019910b5ef0fa91f1c777c6dda5b493a7d45698a2916
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, likely to distribute phishing content or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://dinskayarealty.ru/media/file/35457195782.pdf In PDF document text
    • http://kiiga.ru/userfiles/file/pabukod.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/rotozaludedewexokiwos.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/30223903749.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/33058720371.pdfIn PDF document text
    • http://nessium.net/userfiles/file/94421215345.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e630cc2d60---pivewosu.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/15724367559.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jiclkhdrnvitnj40gicoh3ft72/96033096858.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/27983442565.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/76178901049.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/dqg5nhpgecedfvo9op9iij3f4p/wekaj.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/aaf7a4a1414d5c9c6118fd441595a312/wipagerakusizebato.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909c3671e4f---88772866772.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/37104198393.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc453953f---30956630406.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/jitufedekubonokuserinimar.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0a8a4ba037e0c18a676f16cf5b3cca30/mozobanazupal.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105080122533946.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1e711af3b0b138d3c0547f5d06a1fd08/nibakopidijowasuxab.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/3782620940.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe76592c4a---misizejelapowojet.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/15162199115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=no+in+different+languages+listPDF 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_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 10608 bytes
SHA-256: 2aecfa924d71d6ae96d37ac4e1df7df85be3355e27a8ddf988debd7e62ee1436
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 17296 bytes
SHA-256: bc175272e4aa4aa088eb95a3d4bd2af2c8c01b7a559ab5baaef286c11ebaa0ed
font_02_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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