Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbdc4c00dcc72d4…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 10:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7ceb50d367a6ba1fa645774a70e30cb SHA-1: b5d0c043a3267c0dc45a7734a7750236365c747e SHA-256: 8cbdc4c00dcc72d4dcca100b995d857d7e329da16a92c4c17fe8c9d9ea7b3dc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or malware. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=question+bank+mbbs+1st+year+pdf PDF link annotation
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/bb75816ee9acbfe8cde1699e9d7f736e/79766126264.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de23d7e6c75---domuxaxajenuvixefe.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/57763974976.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nrad3gqt5b4t0t90hqij3seal0/bapudixari.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/bbf150f2dcbcd285fe952685750a42c9/sofamotolinufituvedijo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2a69723851de34710f0ed44f79b2d0b6/gurezi.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/wagixuzef.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9cc3be8d.pdfIn PDF document text
    • https://onlinendttraining.net/files/70043898107.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/51900029257.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ed2b8fc4---99190904358.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/2632195016.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/zenamafixa.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/vojupakenopapalewutaridow.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d32e7111f533e2687d275df19304c31e/veluwawonalisejoxeziwomak.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/1005708823.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///vivutuzixinekalupebut.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/34e4f8e93ba5f2cbf68ce1f15356d2fc/volizamibapukolugom.pdfIn PDF document text
    • http://altinay-law.com/images/file/lenarebaw.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/80883399817.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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 11172 bytes
SHA-256: 0b1b83ad2cbd0190f555757d8d4dc98f9fbed0ee8723d23b073a8f05eb5406f7
font_01_sfnt_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 17800 bytes
SHA-256: 0c52ca6f3d106db933dde61bec11c02c0041dd449dc06a4fa41d60e5a2ab5e02
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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