Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd05fa2bc9f0d8d…

MALICIOUS

PDF

89.7 KB Created: 2021-07-08 03:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ae303926911c29006aa1f8da8283a76c SHA-1: 8ce095e5d8be92b195a3c5616ec442fb10095cf5 SHA-256: bdd05fa2bc9f0d8de57e40d7f98171b59e2ed4d4b2f1c226eb0877a891afd8cd
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=great+book+of+woodworking+tips+pdf PDF link annotation
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9626d9e6b3682953ef3462dc33083c5f/32911368525.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc743bb8baa---juvij.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3cg7j2e4kj5o0e3uu3f49kmv60/19518938237.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/3409586224.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8b71ee49---mikapidanubazoselavog.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/25328623732.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/74310907275.pdfIn PDF document text
    • http://prestopc.it/upload/file/72220663819.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2677190b4c---12550900440.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/vl8os5mv2f7amel0dg5j635eet/givixadurajano.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca49582923a---75118790902.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/68a96625982e19aef8d6101fbce53b2a/guluzijotigu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad276fcb5da---77574887395.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb57467b9---33178907301.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vgbcvgvckqli94jj35b2k36hd2/84592220336.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/86760735949.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22fb74d94---murorewewikexa.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/xalaf.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/25058905490.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b24e84c2---welofaxugipitejidof.pdfIn PDF document text
    • http://elitvorota.ru/f/file/misisesiberiseto.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c949be5525---sefavonapekenalopokakew.pdfIn PDF document text
    • http://sdds.be/userfiles/file/gexibevonigukodesamoleges.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_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 17360 bytes
SHA-256: 5178ae69ad205bd45eb45ee140c2c6427eae132f3e806e725b3ccbb0e688073f
font_01_sfnt_off00012819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12819 10984 bytes
SHA-256: 6f12aeebb34414f51f9ce56e830c37342fdf4747853ec4e4928f19706e1449f6
font_02_sfnt_off0001416b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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