Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6897d0adccd016…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 14:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a1b230aface9704af5d203a34de762f SHA-1: 79676e6196dc7b77fd77ca646474800bb7a1f5f5 SHA-256: 7c6897d0adccd0169a3ede29a6043fb4d0e0fd1404f4355a81c792cbec98d38c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting or linking to other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=classic+motorcycles+for+sale+usa
    • https://digireg.com/upload/72021391409.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b8d7f6d0440f35edb6d6513145049914/49954297904.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aceb1e97b2---85378826379.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9e08b240942ca0a1c2fdaaed24b2fa8e/dexozubi.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vevaluxinujarizitepuf.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44bb1663e4---gujekivugavimamo.pdf
    • https://travelstore.tn/userfiles/file/31575336500.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21f976385---suruvi.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1fa875b49---tuzuvogawokojuguzomufi.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098455eb8bcd---lixosovemixine.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871b95a2943---dixades.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c3f4941e60d60d0ab06ed520b8076518/polebodalebeginivis.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/8974799457.pdf
    • https://my-natural-style.net/upload/files/sapugovuv.pdf
    • http://berbun.com/user_img/file/fipomiverupafovibufaza.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee23.bin
17f200948c2a85e92ab49a9d9f832c7943850718efeee974ad04295e87d2d350		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 17580 bytes
font_01_sfnt_off00011bfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16792 bytes
font_02_sfnt_off00013414.bin
1a7fb0bb02c18c91d5d8b672494ae585d11e9f2caf0e619a2c13abe3bb27841a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 10640 bytes

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