Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b171a0bf9382bc…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 13:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5dbcf534e4f07eb8dfdfae2b68d68b08 SHA-1: 08286b6e04dd0a17d52112955e696e67ab1292ac SHA-256: 52b171a0bf9382bc45e24d1c051fc80d926c7bad0f4168f5d4165383535d95d4
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm for SEO manipulation or malicious redirection. The ML classifier strongly indicates malicious intent, and the presence of JavaScript points to potential execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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://catamma.ru/uplcv?utm_term=nissan+micra+2003+manual+free+download PDF link annotation
    • http://daimarconstrucciones.com/images/admin/file/19298622711.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/91381997156.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/naworebalugikabejefoni.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/kpvlf8vc7bmq16jhe12k36tc25/4889689378.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qljkn0jgiecv8o20tlehto25p6/retelelod.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/zedimidaroxukow.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pagozomitugurewojatokaj.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/a5d92c34c3c410a18ee69adfd13f9ac4/15009840235.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5b3b74936da5e7aae2f144a924b69961/fenoxafap.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/6962761801.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/sixudopig.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/lafebesezuko.pdfIn PDF document text
    • https://aashianarealty.com/file/ponegizavimusijipuzedufoj.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe52787557---21566870481.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/80483800833.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901161003977286.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/kerisipogutud.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/26132912665.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/65964807150.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/20252097000.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1ce3cead---21650389503.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/topipijumopoxa.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/nedumawunijedotovalig.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e25206e1f---xekafawofesifona.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_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 19756 bytes
SHA-256: bb88bae77ae97c795b4cdff96dba0dc3591bd60842415c8f8738298f0ca3a5e1
font_01_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 11116 bytes
SHA-256: 6564a12c42a5f851e273131fa35f433ac1aaa902110981f37750afbe7cb8c7e3

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