Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3bd8ddeead6fb7…

MALICIOUS

PDF

89.9 KB Created: 2021-09-01 08:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99db5bd5f77d6d282d32cc62346c60c8 SHA-1: 100dc58e47781b69c7678c269d901da191003b43 SHA-256: ca3bd8ddeead6fb7b26edb5fd6e55bc41f656cf1221bd42894effd39692a956b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised CMS platforms. The heuristic firings indicate this PDF is a link farm designed to redirect users to potentially malicious content, as evidenced by the ClamAV detection and ML classifier flagging it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://medvor.ru/uplcv?utm_term=importance+of+computer+essay PDF link annotation
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/043b4d232e9aafae16fbb2e29e6d7ef5/94562321410.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/33361547510.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/304ve501t5fdnr8seho0ae2gbo/57338941401.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/58760322418.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/9781409161.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c575a0e4---24605500144.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/vukalixubuvuxekolupabi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ec4a1gnqr522jmikcubgpjsib2/23890365974.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42aece4345---wawaxomuxugomifigakivutef.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/fizovafim.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/newogelod.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/30531860790.pdfIn PDF document text
    • http://capital96.com/userfiles/file/darajisixorezabo.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/vafawudibajisiti.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6da57aa35---vojutaludupakekus.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/xapimasipuzozadaxipis.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/giwusevanomatuwo.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/86726459386.pdfIn PDF document text
    • http://panteres.com/files/files/zixukobunega.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/57084020747.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/21671900269.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/676af3cn8800lmdq1t6os26pu0/99080202043.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210818204207.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/92696265007.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/xepupuxaputox.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/donufupipa.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_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 10668 bytes
SHA-256: c72091feb428ebeff6db914807109f252aa558e9ef646146b68a564bc514cd55
font_02_sfnt_off00012d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1C 17436 bytes
SHA-256: b0344a661a9aa0626da0f820bd8036ea6c745055238c771f106ac92296f14cf1

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