Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fb986dc9d6591d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 18:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e38ffb44c6a74368bcd9e04400768c4 SHA-1: 077510a64842a8ab85ae337b04e348540308dff2 SHA-256: 76fb986dc9d6591d10b87fe8900d40221d1882c2de1126e04e3044dd43200eeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised or disposable domains, indicative of a link farm designed for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+full+online PDF link annotation
    • http://mdsalon.ru/img/lib/file/joronulop.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/96258539421.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc6751fc0e128c0ee4c5557814567617/52517110919.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/7665973666.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/megarevekorenaga.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/muvidufuzatew.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/jufamijirivojid.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/teporamijedadokirulutido.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/35927179247.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210910023711863965pgix0.pdfIn PDF document text
    • http://vkts.se/userfiles/file/nefavejuwigokefume.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376041d3bba---44447186232.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/90899777610.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/betuvopejitanuxeka.pdfIn PDF document text
    • https://hgb.se/filer/file/punofefizujiz.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f557d942ce---42369865645.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/gozedotulikazezik.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/dogoxemupegi.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/kanekasibedumugos.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/75700125661.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/62446637672.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/lunarivutedekosuvevusuz.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/zapuwegimogurufudim.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b3863f8fd---tafajirekuwewuxagebuga.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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 10832 bytes
SHA-256: 48e90bf5f2f6ec9e9ba224436d92b1f0f668a7f68ef1fe8caae347194364152a
font_01_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 18040 bytes
SHA-256: 73ea2ee009a77a8f2950bb0fe063222420c8d1cf2bfdbee960b7c6031274ba47
font_02_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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