Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db0884470ba3cd2…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 07:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 78ea6cb8a7355c9b4467e45a9318ea03 SHA-1: 1a12b5c8a75d025957abaeb132b7cf0d9a097dcc SHA-256: 1db0884470ba3cd2ad758cde54efe1f5fe5cadf4144552dc5a16a3ca69be05a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/eaa20b210ddee830b41db0e80d5adb9b/titorasitapubowavularom.pdf In PDF document text
    • https://marljivo.hr/userfiles/file/zerusepezoxedovanop.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/90211286152.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tuziregizibidesexobiz.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1f52fafb---30347114169.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb913b7d6---duzezobanuv.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6ij1g55tl0seo4f4m18315a1e0/93043306972.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a96490c785f---sagoj.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/miwofagidujumonimos.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/j5i7ke36kdb1ciqggmbbomeuk2/xajip.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/nuzekigofomodibanisul.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b0844246fa86443d4e3273912c8c2ad7/94075091345.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/sokeviwigizavufolamolinuf.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4cb8ba2a135a8492cef3815296866841/12443771129.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/3472996058.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/cf4e702bf1a632ecb6f4ee09463e1613/34190354506.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/dujidosaj.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/19344118938.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/71173400196.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160863201a8b70---wigur.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f2e99a8f9b67541991216bf9d59109ba/51275705751.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/40642986154.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/omem4j5qudpsu56iga3vdj48ne/6145552977.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3029531d60fdadcc841729e9278c73f3/xapomom.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/221ab22f05e05ae93975bfeb28fb953d/vebofolukumumakonadigog.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/07f9b720dcf32fee866a53e9a834b39a/14454807888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=enterprise+networking+security+and+automation+final+examPDF link annotation
    • 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_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 18012 bytes
SHA-256: 45f6fe603076b520491772740e853aa3c073bdf1b1ca172f4634df9e37226ff0
font_01_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 11440 bytes
SHA-256: f07eea3feb9bf4443eb164a1e2b00a3e20112560b7f5311f759593c6af55c0dd
font_02_sfnt_off00013955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1