PDF malware analysis — malicious · e65f4b803e1f2f55

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 13:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: bc6e6befd057d9c535173f7e0a5fc908 SHA-1: a2184149bc05907a2a48dff7eae906127c5cfa56 SHA-256: e65f4b803e1f2f552889cd2d2bb7f66fe0798a4b9e90245e0c2b4a524b55a999

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or redirect users to phishing pages. The presence of multiple compromised CMS upload links indicates a pattern of leveraging vulnerable web infrastructure for distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

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 http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087cbc81338d---61961123112.pdf In PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1cbbbc2835---fugodarebufugegomawege.pdfIn PDF document text
- https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/011e252825faee5f800a28d16847e791/74428117506.pdfIn PDF document text
- https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/kmoae6vd350kmnco03812g3c1l/30132035619.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f09bb7aeb---pasozewavubugokofo.pdfIn PDF document text
- https://binarbaidrealestate.com/public_html/userfiles/file/51074480828.pdfIn PDF document text
- https://egyseg.eu/ckfinder/userfiles/files/ronufameta.pdfIn PDF document text
- http://kelkenaghshband.com/app/webroot/img/files/44191820045.pdfIn PDF document text
- https://pecsikult.hu/files/file/rikosolaxakurisinuta.pdfIn PDF document text
- http://apsara.ru/userfiles/file/8283063749.pdfIn PDF document text
- http://cecev.com/stockages/files/39977801672.pdfIn PDF document text
- https://weyergans-hcc.lv/userfiles/file/gugasusadifajapufedud.pdfIn PDF document text
- https://agermag.ro/mm/file/bisuvuzidaxivonomijuruwi.pdfIn PDF document text
- http://clean-ecology.com/Upload/files/47691531143.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d22e89ae592836d71197d624bc416c1e/44988746315.pdfIn PDF document text
- http://thegioichuyendong.info/app/webroot/upload/files/74549187811.pdfIn PDF document text
- http://buergerforum-tirol.at/file/20199724492.pdfIn PDF document text
- https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/45f82f7e764923f4d91cd38316461e84/12338242934.pdfIn PDF document text
- http://anjilh.com/uploadfile/file///2021042902574794.pdfIn PDF document text
- http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16104d7fc69487---33505490661.pdfIn PDF document text
- https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c81af6e52295d14dd83162d8954050fb/foloxedebetow.pdfIn PDF document text
- https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fl9hhmbrmjg6kpdhcal9ak5jn4/luvabevutunopabujuleseb.pdfIn PDF document text
- http://www.nbc.com.vn/ckfinder/userfiles/files/jisufe.pdfIn PDF document text
- http://arunimaflavours.com/userfiles/file/2406172819.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6848f88e10---wudironamejoxexibuxeler.pdfIn PDF document text
- https://mtydizayn.com/userfiles/file/tudezudavubawodefofexas.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mooring+equipment+guidelines+4th+edition+pdf+free+downloadPDF 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_off0000b7a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7A7	17568 bytes
SHA-256: `96678ce2313e458be0a14d28eaab6a0d5f5929528e93248ace10d48835d31f1e`
`font_01_sfnt_off0000e4e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4E5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fcfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCFC	11348 bytes
SHA-256: `f71b0b22b7f81c6207fefcbfc9a25411c32264e180e8185bf9ff050071ac5144`

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