Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ade65c1707a31bd…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 02:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8f6c06e78405ba2c3a19ac5ce7bc11cc SHA-1: 06f5ae849ddafd880e3f5586b4f9a6e8dd85ace6 SHA-256: 6ade65c1707a31bde40550c7840cbe68f5d418fe095ca64384d8cb0c7c3a4e0a
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, likely serving as a link farm. It contains numerous links pointing to compromised WordPress upload directories and disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/botupuduperosuno.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec54ac123---tesuvupowoxulimo.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/86076536673.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3e8b31a3---vepolikikig.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c491a209c8d---ziroxu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef4051c8f---88974402329.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9uj96ssh42o50f61mpefmmvsgg/dukoz.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f57cacacc1145faf1bbc9e46d9e02363/89524771187.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/878vm4m5e0jqbmpc8qco837l60/kilasazelojijamur.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b9dd4ac167f04b5af88dd35d1bd6b5b/70744245016.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076414d0746d---fawegiwaruseg.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/24641373828.pdfIn PDF document text
    • https://mojer.bg/files/12456895096.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843f21506c---nemekafavezatukaliwasumo.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/fezepero.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/c992f9f86def082949d2946172f83e08/40373230093.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/98204293390.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094233e91667---bapozijubiwatiminimi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/senitusad.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xanarolixujemimumi.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/wekopoxozexekosetulavix.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/62385977467.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/869468eb49aa33f968d9f38a02a96b01/ravuzuvoje.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b19c7b4191a0e45b94dc3d43cb8fac8c/4057773225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=precocious+udder+goatPDF 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_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 16672 bytes
SHA-256: 76c783afcff3ae81544661c9ba6c04fab00bec94dab8da74f4fa479f11782e98
font_01_sfnt_off000119b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 10496 bytes
SHA-256: be34006d0f56b82142a0fb48a1e398d8e179255c5c35229be194f722cf7f31e4