PDF malware analysis — malicious · c50dba0423f486f0

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 06:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d04b6bd3243bef4d8bff25c84a155732 SHA-1: 68d095284f3f78bb11f5efff90571f84dac86520 SHA-256: c50dba0423f486f043e712d0ba4942effa1d120720420aa16ddd51b8a9c2d8de

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a likely phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the structure and URL targets suggest exploitation of user trust to redirect them to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://unseretochter.ch/images/file/bazuxuzuradejapujerugule.pdf In PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada41723546---tezinivibubete.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc284b26e91---muxolosupokoxepewofike.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2c56i8fot40bl963g23pv2rblh/zaluvukaviwon.pdfIn PDF document text
- http://scpt.it/userfiles/files/dubulatutizuk.pdfIn PDF document text
- http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161238c5be01df---76150559538.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/73010041981.pdfIn PDF document text
- http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/66038186345.pdfIn PDF document text
- http://joinsocialbubble.com/cake/beta/userfiles/file/gakelu.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/30sa2s1qot939ir7i6l8ts4865/6417446127.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/f6llfce2p0kn17vvc9om5de68b/rebumutuvapegigil.pdfIn PDF document text
- https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75610e3139---30964757706.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa50d8e4ab1---12792589013.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e007875b---93738892844.pdfIn PDF document text
- http://www.alexgis.com/siteuploads/editorimg/file/revibudak.pdfIn PDF document text
- https://ebooksweb.net/files/file/74218440295.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4201211957---47080120572.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/eeljdrbugnld846smg5bo74l9t/lekisolawar.pdfIn PDF document text
- https://rockyhotelsgroup.com/uploaded/files/87067565344.pdfIn PDF document text
- http://www.binghan.my/userfiles/file/78206631382.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607840aaedad7---28761677400.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b6dcaed0ee6678c7ccc768b38dbf60e0/zapofurexuxaf.pdfIn PDF document text
- http://poledance-chrudim.cz/files/file/tasolukefonegodoleji.pdfIn PDF document text
- http://networkinglikepro.com/ckfinder/userfiles/files/41859828055.pdfIn PDF document text
- https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/6093803de12c764641de32f5cead8f1b/pikagepe.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/996e478eee0bd08acda9d31e31d73d8a/10600710114.pdfIn PDF document text
- https://irrisyst.eu/files/file/genal.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+crossing+jk+simmonsPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eb34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB34	17160 bytes
SHA-256: `903714f10489c447ab6cc4e254459aeda421b9782d6e49ae29849563ebe6a3ab`
`font_01_sfnt_off000117bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117BC	10556 bytes
SHA-256: `8676f4fc0d779609cc56deee47472340ae2f8bc19960c7c53656f38f56f41bb0`
`font_02_sfnt_off00012f95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F95	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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