Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78471bf60a2db00…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 07:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2af142162fd103df94b935f55d84696 SHA-1: 82e1df345ee35bbe7cd457333d2bcd68d0022b79 SHA-256: c78471bf60a2db006dc432faaed3a04492b495552933e88b62c15ae48b12e137
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, further indicates a malicious intent to distribute or host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing or trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/82232235a7d0123bd771e87f237b2c1f/15527697123.pdf In PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/k4884c0lg65ubu404l2oi1ump7/18706279339.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/81005636117.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/sodag.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/lisibosimiwidel.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/rilebesewumuvepe.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/89911828554.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202108142213296283.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/jisopivufojizizorav.pdfIn PDF document text
    • http://rilta.net/userfiles/files/regotasifelu.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c767a4d334---muxudetibodawugevogiwus.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aio92crgm6d0aarrdd7ngng5j7/57243069539.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/u13r9rkthghsm787t652hqppcf/44382848106.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/32523463538.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/99779163976.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0975aa050---fupabevirugig.pdfIn PDF document text
    • http://delve-cr.com/uploads/kudakuke.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/41390141176.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/51991057370.pdfIn PDF document text
    • http://elai.kz/upload/2021/08files/210815082256762180ibl0p.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/sofowexowuzadomagipig.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/kuratasufirobolowof.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/6l2gkoemoiqshqrosviqlr9u6p/6425780901.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0e3225297f9e8e506e6fb57d76347b37/16276389520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=aeotec+zw100+multisensor+6+manualPDF 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_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 17692 bytes
SHA-256: c7d26cbcf492857b39cbe487d3f5fadba35008106d568c5d758217f365edc224
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 10960 bytes
SHA-256: b453031c773bf8ed396bb788a9d68204670780b30c2f063d40f6956c37ca56d0

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