Malicious PDF — malware analysis report

Static analysis result for SHA-256 900d90e8ebb1e774…

MALICIOUS

PDF

99.0 KB Created: 2021-06-27 07:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8610b4e2e22b055f441a49aff69c90fe SHA-1: 17e0dd86bac8bc34125d4ad45e167cb1af6b234c SHA-256: 900d90e8ebb1e774d1c68a20caae4a05f0983c5357c9c164f272ea08ad3c7772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://allycatering.com/userfiles/gilonemabawixi.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ihkjga9nsethmug26bouo20hpc/wulavugi.pdf
    • http://kasargod.net/uploads/file/79255848822.pdf
    • http://barcabianca.eu/upload/file/nikeso.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/puvijinepunananosuloti.pdf
    • http://agcslohian.com/userfiles/file/68052250660.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1fce0ed2---95456302803.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec754bd14---85295926914.pdf
    • http://aquatherm-graz.at/files/bibiku.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0c4e0551---zomufuzasukibufulaxiw.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e809e5705---mozijogaxiropiwapopem.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/us88vn4svidpm0tppk45seo421/29179936945.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0926fb12d3---96688587719.pdf
    • http://jechtinger-wein.com/jechtingen/files/78038462649.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d5c422de78f6ad2f9c367c573d58a064/dujekagidolixusezuredeto.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a536eddd8bd---pibuputamuvunamap.pdf
    • http://iphysiology.ru/upload/1076131839.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94ba134a2---48940000674.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c354c862a---28318388585.pdf
    • http://arci-mp.fr/admin/File/29464482179.pdf
    • https://rpdev.org/ckfinder/userfiles/files/basezunoridekufig.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16086470944ef9---tosoxexolowita.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ts9td4pjq2qf243o5dfpj6m559/buvubunuveporimekitajifuf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=daily+csf+production
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16792 bytes
font_01_sfnt_off00013794.bin
046ea7f1e37d54de5835262ae5c32e6d8f5bc26769f696bb50b6fa0f01050adb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 10696 bytes
font_02_sfnt_off00015042.bin
2cdb797bc9b6c95b0871366257a8a5d1fde5f22f9f0034831bf0e35e4f3e2a03
pdf-font-stream PDF embedded font (sfnt) at offset 0x15042 18288 bytes