Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f2fbe8dbcaec24…

MALICIOUS

PDF

82.7 KB Created: 2021-08-26 02:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45549ef4cafde1234962225b291feec9 SHA-1: 8a38fb84d7e64d0e977e0b16914a4ac961ce3af1 SHA-256: b5f2fbe8dbcaec24278c2c4bea6274d584f7d64286007344bf030a0f7db3ed02
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=vocal+chants+sample+pack+free PDF link annotation
    • https://eghamatyab.com/basefile/bainbookcom/files/47529170589.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/vetekokuwowurobipem.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/mefebupebugis.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/62658148479.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/70263352931.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v798gpb2q04f8d6pds6d258c3e/wibemoroji.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/51275757987.pdfIn PDF document text
    • http://zenithmetals.com/files/25713663740.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/topozexawoxonebufokibi.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/magibavog.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452fc3675a---sogekoxozakir.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fogufobigajutumeda.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e54bf184---bozozaxegarigegutofabu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/dasopofuxevadaba.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t3n0s631d0198rf56mlq24hbfm/nazirawalereliwik.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/37980846045.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/fosuba.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/vd47mj2g55vailg6gofp2gl6n4/nuvatunijevunofi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862ee284d13---figimipakowipuwa.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/7646592130.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118c6de1b53d---jesopekodurofu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/83533455307.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/nexij.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1fb94ffdd---ketewadinafegewuw.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/pekixepaxamezat.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b85d22dc7---supemibomug.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077961cb9ef1---37191282713.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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 10712 bytes
SHA-256: dacd607376152694b4bf03f6ae967a2df36c1223662de8a3d13f08fea4c2c38b
font_02_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 16680 bytes
SHA-256: b5e3be0eef9d2839d427a8dba65fccbac1603aa6c0f5ca2b51242843dd1f926d

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