Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa319c306df2aa5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 12:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac68ebb51815be37aaaae7482344ace3 SHA-1: 4bc3e75cf8b81d6e01e0685a7d80adc86c3c24b7 SHA-256: cfa319c306df2aa516e0b761029b027fa1adfb48ab0889875944a9356f043ee4
104 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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=transportation+assignment+problem+pdf PDF link annotation
    • http://duquenne-moteurs.fr/webroot/upload/files/90209602316.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/54333068828.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bb426d14a8df34b9769d405166f88efc/27384034737.pdfIn PDF document text
    • http://momsystem.ru/public/file/35272817870.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a415163b22ddb931af5186ab8137307c/45904258880.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/50999776868.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/julemewivadabovujuje.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/gijepawumekikosafusi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/37520535355.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/29032259805.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/78899479804.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/40898139423.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612416f90d496---6936209915.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/83960090262.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/janakoliruwafikitugajowu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f70208eb6---83561753289.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/71867552026.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a2caa433cc05880971732955fa87ffd1/60658707936.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/95219270961.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099771d2dc06---dunid.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/jozivanuwafivatigixujij.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/loxesejepujon.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed4163977---12076553574.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3f392eec37f82fdfcdfb6d3016a186d7/16361372185.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/sagixejamebolatem.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_off0000b9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B6 17076 bytes
SHA-256: 9cfc77ff6df306649a15d2e84cd300eae27713fe514068d9ad85433c5899eb83
font_01_sfnt_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 10944 bytes
SHA-256: 9840e35331dcd5dc7c96b433de63137c0c8d0c4c060921ccb463a5a38a0827ca

Open this report in the interactive analyzer, or submit your own file for analysis.