Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd08769f6e893ec…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 23:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24f2818f92f4c56f9ffd0f7e5e6bd950 SHA-1: cc3c827905711860df130735b1b13e283678df8a SHA-256: acd08769f6e893ec51f9e095441c68028afd5e6c8c4595fab5aeaaa112e28217
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=color+by+number+halloween+coloring+pages PDF link annotation
    • http://novosib-sport.ru/ckfinder/userfiles/files/21815121447.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/6c8188ee44bceed9527f71e24460c68d/vuzodupufuruxuxomivenoni.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/gadesizemiza.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/ludaditazekuxiwi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ae49ed7d510371522036c1090d92b350/53825916030.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072dafcab80f---dunifa.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bc3e019a9---xomuti.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/70169437570.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2urq8isqbv8rve45b3l7f3af1i/tijomopu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e24799e5---kulamasado.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/57e42682c56514c29f4b54317d7d389a/79223083711.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/takowixugixizubopotokit.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5f1b91fb4---luvusog.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160858503437d9---3530181081.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/47437690096.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/zodafi.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/1464713524.pdfIn PDF document text
    • http://gerocuki.hu/user/file/buvobajobowazerikeges.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/87410501671.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/witidotemezowi.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/37c4f6be129f0ae685817506ca7ffde7/funumunirikenaweduga.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/gubuxadeko.pdfIn PDF document text
    • http://www.celso.org/download/dopokejijuwujewawijopakif.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/50935724808.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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 11196 bytes
SHA-256: 027dd9d953f15ae36f862f3d285832eff6aeccdf24f3a304dbe61a8c1a566657
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 17364 bytes
SHA-256: fdf0a51a9c91ae209fba30fa69c830145bc4aea423e83a72c41ae650236ecb7d
font_02_sfnt_off000133f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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