Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4d8da5dc8482ba…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 03:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f7707293aacaaf24beac18a38303117 SHA-1: f5997d3e847859765d16379941dc0e6f0f0240bf SHA-256: bf4d8da5dc8482ba8736cfa79f018ccc14779487b6367ec56b402b16bbe1d891
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on disposable domains, identified by heuristics as a 'SEO DISPOSABLE LINK FARM' and 'COMPROMISED CMS UPLOAD LINK FARM'. The presence of a 'Visual download / call-to-action button lure' heuristic suggests the document is designed to trick users into clicking these links. The ML classifier strongly flags this PDF as malicious, indicating a high likelihood of it being used for malicious purposes, such as distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://0985028898.kad.tw/kads/ckfinder/userfiles/files/84474664840.pdf In PDF document text
    • http://candientushinko.com/images/file/pesoba.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/40446789324.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/mudinawarugatexudesuko.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8559b8a82636a522a6015f793f7f1887/lelobubabikusuxefegolifod.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/gupujikulakugipobiwopiza.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/guwelugujilowa.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tlks6ajdv4t1ae8ukro0tlirc9/91200202960.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/70747740194.pdfIn PDF document text
    • https://tepihtrava.rs/files/kepifawovisizeripogowip.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/kikizafigufojugub.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/mugawiwebujivuromi.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/22721004345.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141043ad030c---63471893740.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/40792337670.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/69761768887.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/79821833625.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/43022427169.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/fubugalifinadikudefufibub.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163117d0d0---71382265004.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/givulize.pdfIn PDF document text
    • http://langmypham.com/luutru/files/39688905932.pdfIn PDF document text
    • http://julianina.de/upload/file/pagujage.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/9065607770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=indian+railway+simulator+game+download+apkPDF 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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 11080 bytes
SHA-256: 81b4798c9c907882a7f1bbcabde14d4f8ffa1fface3c364007c1630c594b922b
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 18764 bytes
SHA-256: a185fa5a231e773b7f9c5f8c14f8f260ddff5acba1dc1c247edf690e6dc305d3

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