Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d90b9c43ae23f33…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 21:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 459da49b83bbce2e0d1934be9c9dff81 SHA-1: e18bc9c1f2b828736f9554a7a8d597fde580825f SHA-256: 0d90b9c43ae23f3321bb2ffc4e9906dec7d50231f28358fe36c4f3dd259ca0f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream, which is a common technique for delivering malicious payloads. The PDF also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sushi-belovo.ru/files/punupowodimanipav.pdf In PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/mamusotakogezazoperoneg.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/14653129321.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23f3a2844---80707502737.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0ace83db44hmf9a38irdrufucq/fobev.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/5187156561.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/regabuvadafevefuxuvorog.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/tuzadaxujexoforasatefawo.pdfIn PDF document text
    • http://ausafe.net/images/art/files/93671721841.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/57649868560.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/55500502168.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/82560343496.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/gudadeluloligalonozoke.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16114bbae30dfa---fuvarubadu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f70ca2874---62716789517.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790f17ca5d5---99385749024.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/walilufi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d2154ed2---letadominuzub.pdfIn PDF document text
    • https://bataretak.com/img/files/file/61309178759.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/juxapono.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/90995854842.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3ae4435abfde5f3e5637014f0e7d0871/53432093991.pdfIn PDF document text
    • http://ipublicity.cz/data/file/naruzofawezitebososodexep.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/88442737256.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/rebemorakom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=poulan+pro+300ex+owners+manualPDF 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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 10804 bytes
SHA-256: e0a96b20394effc57a6d5260e933a8487220eb973d055090962b7e80965d8e1e
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 18916 bytes
SHA-256: a34d0d857802d11b8fb525143bf72fc9c809aa2966cbe80671dd3f80a0a51c87
font_02_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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