Malicious PDF — malware analysis report

Static analysis result for SHA-256 9784c594855aac85…

MALICIOUS

PDF

72.5 KB Created: 2021-06-30 04:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e7685db9c2609758898d9498c9d69f6 SHA-1: b947f12f06067958756288cd8d1bbe4795f44b80 SHA-256: 9784c594855aac85e8d08c6527db01818c36b13c0f6c7cfabf956097f3fe0348
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://studiobaliva.eu/userfiles/files/wafed.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2404b56d43---92783076658.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/cru54ehiml0dk88ia2n7pr8gao/lanumegexofekipe.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad490e83c---sasofugoxasudafodibimalin.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6hdmiar4cjtta3viusoo7k740s/19244265275.pdf
    • http://bocghedanang.com/media/ftp/file/rupeg.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d7434b8d3e7095ea9db2cb767d1ea405/fusosowepewosuvafev.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa00142e8f---9629704271.pdf
    • http://zabradli-znerezu.cz/userfiles/file/mikesulideledan.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071850626eac---gowobusom.pdf
    • http://erdivigado.hu/userkepek/file/54189678511.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/2128d0c23f3f98353c2e8975a416851e/84407643004.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc0697e222---46779414353.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a710049a5b4---delosesozapeniladugujaza.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3f63d001a10fa575e75a15519e681d47/buxivetoduv.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c14e02f22bd---lisulutabuniwonuj.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc4cd29cc---fenona.pdf
    • https://greenline.bg/userfiles/file/fokudanubobujapajokedabex.pdf
    • https://propiedades.net/ckfinder/userfiles/files/boruzirudepaxazugixusulo.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/5ki02uhahoq4nej9a4a0ffstc9/49005059903.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160734403be23e---kirilodo.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832d795b657---xasumog.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vrqo87afar4a955a2ci7gpkrb0/vigilupagutetoruronavije.pdf
    • http://sam-global.info/files/file/68588140659.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=blood+sugar+and+thirst
    • 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_off0000bb83.bin
d4fd772ce7ff9bcd05e229e801aa6332d7996183ae4fb3ac9bc9ce6645f4ad65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB83 16936 bytes
font_01_sfnt_off0000e4ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 16792 bytes
font_02_sfnt_off0000fd16.bin
3b3e82151bcf8cc42c5bf6f85c6b6eaa230410e95496c89970dfa1dcfd92c515		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10548 bytes

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