Malicious PDF — malware analysis report

Static analysis result for SHA-256 5726575debf661bc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 04:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5628b01b3c613b8dae5e3c94331dfc6 SHA-1: 6a78c54f118c1b35209c1fdfd90666044e490a6c SHA-256: 5726575debf661bc6edacf762bd556a0230fc3dc647b65426aa4bd4e9567b7a2
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. It also features numerous links to websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.cafeinca.com/img/public/contenido/file/45511148965.pdf In PDF document text
    • https://ms01bet.com/contents//files/53322368589.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/459fee2937585942cba7b6138ac0423d/simed.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/kegejasonukimibunazuzipim.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/m55keiufuil4k1enj0td5cq9ka/muruke.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/99556441101.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/solibubupiwizakekedaluwod.pdfIn PDF document text
    • http://domainecomps.com/documents/files/bozamopotofi.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/sinejekanofofid.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/51077754619.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4q2ieqs83jrl3bltt2pp4ijfpt/rubobidimoritigi.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/letupos.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3765669c3532369fce538cd2e72bc9b9/9184662637.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1b20d42d---rotopuvujavaxedaj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a07442d70ed---finug.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/53035605027.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab58bb05058---79635261396.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xifeselatowuwar.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f2120e038223a50344952cefa9b790b3/13432345985.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/posofuvubunowijekokedi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a2f8df0298dad417f3512a7b5725ddb3/57666451730.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/nefupu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c7fb0b0cae75efd94512325b1135b4fc/34635653108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=anti+money+laundering+act+2013+pdfPDF 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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 11456 bytes
SHA-256: ae5a4da5d628a94a3409545d80e11a22ca1336d8427d2573eb294c83e8adcd16
font_01_sfnt_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 17056 bytes
SHA-256: 29fb2bc0d0c52c49896af693290efec6d3a04c27359305f7d68f3b2ed4ff510d
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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