Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc66e39b9f3c859a…

MALICIOUS

PDF

96.2 KB Created: 2021-09-20 09:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c38c9c07a5f947a1474f778e61d77e08 SHA-1: d61c856bdc34f3e9e272cbcc007e824ea61839d1 SHA-256: dc66e39b9f3c859a870077b757909735740fbc05233433d6160e7bf9b567ef06
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. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dtd.com.pk/ckfinder/userfiles/files/11279184527.pdf In PDF document text
    • https://sooryasales.com/uploads/file/65926785260.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/fizunokukoxozoxube.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/30522660559.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/xezisovofowag.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210918/0614394140.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/ketigekurid.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/semidajuguxu.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/gilojoxitu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fd3dc70ae1cd72f593f105755be6ac6/volejeweximisume.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe389e3c1e---rikomenaletumifiwesiz.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/20017543994.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/1586420807.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/68109009892.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/30981593194.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/33210542866.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/96925444299.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/novik.pdfIn PDF document text
    • http://net-work.cz/data/file/jivujoxowiduxevedeweto.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/24671924068.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210910083133106.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e27f5ac3e4---gulovesitiv.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/munofesuguxitemitudabo.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vafopezefelam.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/7853404252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ciclo+reflexivo+de+smyth+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_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 10932 bytes
SHA-256: da6e6be40edaf90bf0ec3c8a56ba877065ace655374e452bd63635f277d54893
font_01_sfnt_off000129c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C4 19152 bytes
SHA-256: 6c3097d18f95e30a9ff3119d23d02a210fa1141390d862bf5d6979d0f45565ca
font_02_sfnt_off00015afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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