Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e555198b541170…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 01:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b2ac227c071c0b4929a196250685d36 SHA-1: b0eb812828885c4718503045f4b7cd99e8c9c282 SHA-256: 96e555198b541170ad636fdaf7a1fda19577985f4186278823b898c009af1d35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to compromised or disposable hosting, strongly indicates a malicious intent. The ClamAV detection and ML classifier further support this, identifying the PDF as a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=naam+ringtone+maker PDF link annotation
    • http://52963566.com/upload/file/202109060302304181.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947ea68f11---55536727108.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/2642310441.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/vomikinefa.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/lumog.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/nizovusulasodado.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/mipubewimawopuvukosun.pdfIn PDF document text
    • http://ihdbd.org/upload/files/92101753682.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613667d00a9fd---remubedixaninisimip.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/oc5a16tajsl7v0q5dsggi9rlun/dozegibunodutulegaxovor.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/23260554059.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/lagorikosilegixeradir.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/24320890238.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/sipupejatuvororidom.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/dokirularazesajinabi.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/libisog.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/89175363665.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/xuzokuraboban.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f108b68e8f---refejafi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52109462671.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/kagijunuvudubinatigeti.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467901a2d8---16050855263.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/32186633300.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/miponuna.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_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 20576 bytes
SHA-256: 5be9dfc74272da70978e84c1ba2e93f7249e56457d0b08c1e8318e84d26b3ad5
font_02_sfnt_off00012572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 10304 bytes
SHA-256: 9bc653d4731f0e362326bbc3433df3eadad75819fdd452580b2a03a785675fc5

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