Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd66fac70f96e15…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 00:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfd1a0d18013a8e12ad27295b5e173f3 SHA-1: 59cc18bebbcddb711c9ff25b186129e4c43debb0 SHA-256: 9fd66fac70f96e15a3b5eb4fd69fb047357d871f200e3574ca57a8329cba4a0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple links pointing to potentially compromised or disposable hosting, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The embedded JavaScript likely serves to redirect the user or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://podiummoda.ru/userfiles/file/95398314171.pdf In PDF document text
    • http://solmoda.it/userfiles/files/danufadopebugozajep.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/98668393167.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/59615097450.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/14148263183.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/38348017678.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/48e7ba3b19e16d40e620fcd8a4635530/tanavemijusemalivudufuge.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/pizeposutedujefo.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/nopitijofulebisekinog.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/difapuwumunon.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/8361333781.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e262dd0d35---66875038894.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3cbe3ca4e---wifetoderopegaxeriboxaj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b0f8eca5---rukokadikazolopo.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/60429497116.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/20952210791.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/26518180687.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/5842213541.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109080547564117844n9h4zbtw3ca.pdfIn PDF document text
    • https://robertbah.si/files/file/48861131874.pdfIn PDF document text
    • https://blugarden.eu/file/dusozefexeverugepisegevat.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/95287913416.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/98124196865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=esl+reading+comprehension+intermediate+level+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_off0000b06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06D 17220 bytes
SHA-256: 12f4adc8941b1744f13a57b580171ee078e58cbddd69cdeff2b5fb7be7d2e534
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 11116 bytes
SHA-256: 32bdc9105f0788fb5871a827aed273dc14b6be88fbe270582aefb3987ba8e945
font_02_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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