Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f47e4275743f976…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 03:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ded14749002600bba595e700c53ce22e SHA-1: 66872a6ff7920e7d4ae62cbc223ef66412792491 SHA-256: 0f47e4275743f97675a95d79ba802e2f3eb26e355e45d9694805e2871c4714a5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly suggests malicious intent, likely to direct users to malicious sites or for SEO manipulation. The presence of embedded JavaScript suggests it could be used to further obfuscate the redirection or host additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://challendor.com/fckeditor/upload/file/vagivedaxagonoxofebakopi.pdf In PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/vefabasurawamure.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/28367166692.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070bb2b97c58---logigaterilodunamasuvata.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/74366185871.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/xezijadapaluzikeriwa.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/19314807440.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/9374934146.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/kizuludelatu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9dpk9b09rpl8mkokic7fc6pru7/58411476951.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/97756339569.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fasenimabebi.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/bijetabudewuzut.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b428582e0c---76242113463.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b1005eef4a9a133a6809dfe45c757fbd/51302133177.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1d93ed8b---lovunivevogifubibojotafas.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lplib171vd9jimduv2pbqsorlg/22906773107.pdfIn PDF document text
    • http://jsdarvin.com/files/wenazasimujizizupoverexa.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3e06d69e5487b9f21a09c132bc7860a7/51490100580.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210717_B1EF557CC40F3CEF.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/84593303751.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a474697911c---tosumibetapa.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/20889920273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=subaltern+literature+pdfPDF 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_off0000bad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD9 10516 bytes
SHA-256: c81afc6b8ab6cd94926b9f7ec1a9199e98379d442a047bb0da390a552177df31
font_01_sfnt_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 15896 bytes
SHA-256: 6c445d79f3111c2c112df15a3402ca25b44f7373f4139e09dbc1040c8e00caf1
font_02_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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