PDF malware analysis — malicious · e862d89fd9a2c44f

MALICIOUS

PDF

91.7 KB Created: 2021-09-08 13:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 9c0e6c734e069f7b39ef4e001602b6e4 SHA-1: f863a59bb55ecfb64811a0c300fe86a84185e3e3 SHA-256: e862d89fd9a2c44f00546ba3074c1acc1b918d3fe5f7f77613e24a92e86b9928

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on WordPress and other disposable domains. The embedded URLs suggest a phishing or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=arbitration+and+conciliation+amendment+act+2015+pdf PDF link annotation
- http://waetsukai.jp/system/ckfinder/userfiles/files/vafiras.pdfIn PDF document text
- http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65931680557.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613809ff45d8e---45021190766.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6147b8a873a61f509ef1cdea39326d39/xuvosuzubuvojutopabif.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840f5a54f9---22038232642.pdfIn PDF document text
- https://radekslodkiewicz.pl/files/file/rowatirosopol.pdfIn PDF document text
- http://drairtools.com/ckfinder/userfiles/files/42972609638.pdfIn PDF document text
- https://sankaibearing.com/userfiles/files/36599167916.pdfIn PDF document text
- http://grandp.ru/userfiles/file/10990405726.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1fcdfa30---jafuvexebawobuxanuwax.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e1043d28---95901777313.pdfIn PDF document text
- https://fullprotec.com/ckfinder/userfiles/files/36463201183.pdfIn PDF document text
- http://eubeer.vn/uploads/files/97991737321.pdfIn PDF document text
- https://stayinbranson.com/ckfinder/triplebuserfiles/file/11777874681.pdfIn PDF document text
- https://angkorphotographyguide.com/userfiles/file/78642923787.pdfIn PDF document text
- https://loyd.rs/images/file/73328826978.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161317b7c6975b---josovurekeravike.pdfIn PDF document text
- http://sity-luxe.ru/userfiles/file/mifitemaganajisunizonuxor.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_off0000fef6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEF6	18776 bytes
SHA-256: `c6bdaa5ed1afb113d3b9a62473d7ae4d475aabfd2b470dba504fd436c4e749de`
`font_01_sfnt_off00012eea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EEA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014701.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14701	11160 bytes
SHA-256: `776ae5337dd485f68d3f779393dd4263880fb3c3af58576c8623f8ee1d5c5468`

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