Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e393b1db2d8994d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 01:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6e1d86d27df34a0b33280861a9d2796 SHA-1: 2feea3c82be35988aa717133adb26df6d3c40c3d SHA-256: 9e393b1db2d8994d3f0f2d4e3cf9ae0f18750c23f912ca480c4944387d48c03d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads. The primary URL suggests a lure for downloading an Android application, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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 https://cructi.ru/uplcv?utm_term=snack+video+app+download+for+android PDF link annotation
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146bea58b23b---desokisuwitegoro.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/1851063169.pdfIn PDF document text
    • https://tcremich.lu/files/files/92814812326.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/29751909735.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/14014058495.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/digudofaregitifap.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/lazejobop.pdfIn PDF document text
    • https://finliz.lt/i/File/wusaxavupopinez.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615049ff3db6b---fiwutesu.pdfIn PDF document text
    • http://hoachattn.com/image/files/8138382622.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/79075662041.pdfIn PDF document text
    • https://questyme.com/userfiles/file/57759141038.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/kusegefilogolonetajigure.pdfIn PDF document text
    • http://ausietech.com/images/file/90361130251.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/eab41f8ca9a2149f464623a960d778e7/wumubolopamogisigupaxefuw.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8d31564be4c499ff1946ef4b0a2fac3f/fewowirupofusuvetufororej.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/varisibifitufi.pdfIn PDF document text
    • https://cap2013.aseat.fr/userfiles/file/sidosudilonujoko.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/83394852427.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/924ec17370989fbfd942de240852a0bd/jaxot.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/winovatazodifotubuzataki.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/54533189179.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/80763952372.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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 10664 bytes
SHA-256: 65eb01ef6a16f3ce30c81a018804a0414349cd78105068c932d11a187e67f89b
font_02_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 16784 bytes
SHA-256: f4426044d960c8b37fbba0b49564301d9acfc0e4d18c10a8f4542eb16db593c8

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