PDF malware analysis — malicious · 9fd7c34695b090c0

MALICIOUS

PDF

73.7 KB Created: 2021-06-28 12:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: d408c6ab190c186720da226c39df5cb0 SHA-1: 62d9df648aa0a74180d7691877511eb39db71b2d SHA-256: 9fd7c34695b090c012e19da76f6d8da775d2fab0c43d62d37dd968fdb315b3c0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm its nature as a link farm. No scripts were extracted from this sample, but the extensive use of external links suggests an attempt to deliver a second-stage payload or conduct phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

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://ketchas.ru/uplcv?utm_term=being+very+tired PDF link annotation
- https://transpack-krumbach.de/_upload_bilder/_filemanager/file/guwowi.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/50693054359.pdfIn PDF document text
- https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3fc8ac843d117b910c6a4c5661a3ba6f/98755903524.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ic17uavs7h9e7j8qqm560fghii/95991618387.pdfIn PDF document text
- http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/bijigi.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8t69no4ssc2eep6lhf3hn5kat3/gimepedanexudu.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c6f01889278d129ff3893cbd025b4997/divuparipefakurotigularav.pdfIn PDF document text
- http://zamokugrofa.sk/admin/fckeditor/file/bakejofarujabulaxu.pdfIn PDF document text
- http://gursakaryahukuk.com/images/file/17188713968.pdfIn PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/475b645b461a4b491f774d15e9275d2a/tofozegusarolaraj.pdfIn PDF document text
- http://irinka.org/ckfinder/userfiles/files/suwoziladavosudatu.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b45ecb5e5a---59814338460.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d01aa6abc2---51881536486.pdfIn PDF document text
- https://bluetact.com/locktactyuma/userfiles/file/legama.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8bfaa193348d5888cfbac8edc8793665/25802895182.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd4db88214---88044488280.pdfIn PDF document text
- http://regimhotelierbucuresti.com/images/userfiles/37380353824.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984824aee3b---vijavironafolipawenuwusa.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/878661ea7edc387b1cb5c5872cde5126/49835478179.pdfIn PDF document text
- http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8671121574---zutoputuginefa.pdfIn PDF document text
- https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/tvdv0pvp5mqnaf4o36mgiesa5i/50945348772.pdfIn PDF document text
- https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ldhr5oohsia5ahn88qgkjoi7r4/rizijokebi.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160701ea4a50fd---93748960527.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe67b1036---94014828982.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fced115934c847e66d0b07c18c3fe821/lixugogudusalaruni.pdfIn PDF document text
- http://praxis-greve-polley.de/web/editor/files/fonulolumumaxepijodevajol.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/df9a854d87bb189ca9dadddc409fe4a2/40446521380.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c15d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC15D	16148 bytes
SHA-256: `7cd5fbf6962395a2136267d11bd12857b4c6bd9aa43f8be6a5a47ad5f807394b`
`font_01_sfnt_off0000eae1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAE1	10160 bytes
SHA-256: `651e404f2a24d0d410b4fba9bc463c9d041d82a98461d7c4c36e30ebf46e6f0e`
`font_02_sfnt_off00010186.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10186	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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