Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dda1cfe6ca21377…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 00:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5fa2245865195e9ab358871fc9a3149 SHA-1: c45af7d010024f7a7a52e7fc81e766aa48ae7fcc SHA-256: 4dda1cfe6ca2137734a0c2eaabe5281c1db39ce61360b7802fe4cd28f8b6befe
96 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious and contains numerous embedded URLs. These URLs point to various websites, many of which appear to be compromised or disposable hosting, serving further PDF documents. This behavior is consistent with a link farm designed to distribute malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/906370c3e0f5a1a6f34938a58f3435f1/litufisajulozasojofater.pdf In PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/taxuwukijifikawemobewanu.pdfIn PDF document text
    • http://temple.mo/userfiles/file/16175326087.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609154cf7c25c---63620082583.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f982c441---16031622255.pdfIn PDF document text
    • https://x-software.cz/data/file/novokogutoxuretipavebirop.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612e013961fb9---wigitaragex.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210725041950.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/19053790747.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876fe7df771---4311759216.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b71161cd---30757459755.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/fuviwagutarumon.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e280d3906---lojugagadujuxanonugulama.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/xasemufutifesujuboxewagef.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a043200f9f422a3c9a071db78e7ece2b/93464846300.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/kugizeguwilexumuvuto.pdfIn PDF document text
    • https://akemi.ro/hirek/file/pixufitifepuporusizomebox.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a882836c25a---45564752029.pdfIn PDF document text
    • http://sql110.com/pic/20413273064.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9eb9e8a0861cac694342d679d9635328/73148311053.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc1cb36b2---bebobep.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984bc9c1fb5---13487052766.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/zajuletavilutilapigo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/50999325557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=assembler+pdf+en+1+seulPDF 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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 19272 bytes
SHA-256: b611a3648c6bf21d85b6814ddaafc364cb5b3365b7765f439a232206ecc15318
font_01_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 10460 bytes
SHA-256: 40261e931c308bee8f40dfbb2d4b65628b6ee1a58f2373567330ff85ccc5c23c
font_02_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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