Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3406d63d72e28eb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 00:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffb16cb957bedd303eceaf33b39460a3 SHA-1: b8a45e1c2a93a4a94543f3cdcbcfe579ba97a975 SHA-256: d3406d63d72e28eb4f7ac3841abc996a3ea1126153d1980f894bc4a4bd6414ee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.gonouvellezelande.com/files/87660519699.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613447ae01419---zagolobifutosujalet.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/75273518932.pdfIn PDF document text
    • http://i-dron.cz/data/file/tijavubelo.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/38231810779.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/73585634294.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/toparomoxumorax.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/24175777713.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f36f805441bce51cf0b1585df2d5b7af/zipoguvepepoto.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/67827106053.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/61184654769.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/tojadaxukaridejijufumeru.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd2726d726---98945029675.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/3694729617.pdfIn PDF document text
    • http://metallpress.info/files/82717557296.pdfIn PDF document text
    • https://bachson.net/upload/file/sajowupujebovaditovajaj.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210912135319.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613425bef3d61---vijimor.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/16704861269.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/13014497917.pdfIn PDF document text
    • http://aven.su/userfiles/file/50802943640.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/24549933998.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/75213935612.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614442347d51d---nubokoduduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pubg+lite+new+update+2020+download+linkPDF 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_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 10960 bytes
SHA-256: ff8cc9035678fd2f30bdbce2af4c62fb2c92f14ef42894992e6ebfb8e630857d
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 18452 bytes
SHA-256: 654971e353e5cd77feea16e696ca9ea2d133f83ae528e8296e0012220e2b80e0