Malicious PDF — malware analysis report

Static analysis result for SHA-256 389117ebea17dd95…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 11:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6510e2c6ac9b78ddbfda202a63bcc83a SHA-1: b9ddbdfe84e5f0842d87e123a0fd4a8f6d309b0a SHA-256: 389117ebea17dd95678c0c3fcc3034d05b06d6de847c1a8c3d4c23d7c4df8a97
124 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 CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are structured as a link farm, a common tactic for phishing or distributing further malware. The sample's primary function appears to be directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://laborke.ru/uplcv?utm_term=gta+5+cheat+codes+pdf PDF link annotation
    • https://profix.fr/ckfinder/userfiles/files/witop.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/zegatejabalovutoba.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109020558494826.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/dorefeba.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131400627e84---bupepebilebibanuziriw.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/jopuwemajojopitaturunuk.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/2967986393.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/4044784193.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/xafiji.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/51200901015.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/vobeke.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/64443129523.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/91646885535.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b1de2626---46168242961.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae54a984a7---tifegope.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/61881892205.pdfIn PDF document text
    • https://umartravel.com/files/74979812778.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/65888303252.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613986d57856f---fakisowerafimoxefidijegi.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109081721198700.pdfIn PDF document text
    • http://regcureguide.com/files/files/67037949932.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/zalav.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/wemifagatudazug.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383b2c3034c---puridipe.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_off0000ba49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 10548 bytes
SHA-256: 3e1d0554f74bbd2917b0b55e5fda0067abbde58d0c9d6b76826745dcb639d8d6
font_02_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 16664 bytes
SHA-256: 5ab1267c1eb567625aabe9594d02b8c9d80c63e5922729be3c159d572ee386f4

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