PDF malware analysis — malicious · ecef4a4424c31b1d

MALICIOUS

PDF

85.4 KB Created: 2021-07-08 05:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: f08bd308680517cd152c7e161ea116ae SHA-1: d6a6453788c419c0af18483bee26bac9ff11ddac SHA-256: ecef4a4424c31b1d3326bcc832cba65bc3b957a070dcb60bd41268044a3cba43

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://oniceh.ru/uplcv?utm_term=how+to+save+a+flattened+pdf PDF link annotation
- http://cambridgekapurthala.com/damana/userfiles/file/9683645376.pdfIn PDF document text
- http://tsrmmessina.it/userfiles/files/texulone.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f063ad185edd69e578fedf31577f7685/nufakojajo.pdfIn PDF document text
- http://cafehinglung.com/uploads/files/lufokigewipunuzeta.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb9544e2ee---39883359800.pdfIn PDF document text
- http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/44816178685.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cpb9vop8116adl2tbk42gtv45e/lebumagef.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a16055e4---depalovenekibepini.pdfIn PDF document text
- https://dolaodong.com/userfiles/file/vekotigales.pdfIn PDF document text
- https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/84b8cg4kp7jvbl3vl16j07es27/titugo.pdfIn PDF document text
- http://playeasypiano.com/resources/fck_images/safina.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a24b67408ca43b69913d07a93a016a9a/sudiremegazafa.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcf613da6---71911820374.pdfIn PDF document text
- https://kermoulin.com/userfiles/file/71541691283.pdfIn PDF document text
- https://www.truck-transport.com/ckfinder/userfiles/files/11339556869.pdfIn PDF document text
- http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91d8b47e42---39860804264.pdfIn PDF document text
- https://liantoong.com/archive/upload/files/baxesuparurele.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4e2ae640---vasadejigata.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/17c9c5f4e2b4ce1c49c9ac61169bfaa1/nigusademomerinanoru.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ji9j3k49conoiuq8f7811dgef3/mizevudadulitufaxuva.pdfIn PDF document text
- http://xn--9w3b11kh5l.com/ckupload/files/doreru.pdfIn PDF document text
- http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160860a825e7cf---76572350974.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/sotupa.pdfIn PDF document text
- http://manpukuorder.com/uploads/files/51112269239.pdfIn PDF document text
- https://asharfilalkulfi.com/ckfinder/userfiles/files/rezotesiloxatevavim.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d44143358---20468961137.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_off0000e972.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE972	10440 bytes
SHA-256: `74791bb4bc93b7c9947cbd4afce067f8fe83860752fd2a8724cfa0318f223fdb`
`font_01_sfnt_off0001014d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1014D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001195f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1195F	17396 bytes
SHA-256: `88da2aa17c3c81b648bc53315e0fb81d0c47be7598a3c23344372c4c2218591e`

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