PDF malware analysis — malicious · 255696663f91af0d

MALICIOUS

PDF

76.5 KB Created: 2021-07-02 08:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 39ee494a2d868b7ecdc5af94b6a3af29 SHA-1: e7b13c770370f3b9e5b449129bd8133e6d2653e1 SHA-256: 255696663f91af0df343e2011d7206745fb8b6b46ab6e977c338eaa6a8c11ad0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://toastwarenhuis.nl/app/webroot/files/userfiles/files/xixikemozekiloba.pdf In PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f3c808fab1dded6f133050438834de9c/72795793375.pdfIn PDF document text
- https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mdois18vus5asvh7a90lvk1lj0/54525194374.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/userfiles/file/dumonorizinixabolukibi.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5132d0eaca6b935b5bac8fa712d60166/2787153885.pdfIn PDF document text
- http://brkvinc.com/userfiles/file/76513035025.pdfIn PDF document text
- http://evohome.pl/userfiles/file/belanot.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5f8d01f6d984a8b8d45ecb24fef378de/tejopisabeluvigekile.pdfIn PDF document text
- http://mstreatmentadvances.com/userfiles/files/rejujoxavaraxobipotu.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/u7t391iufjbc3lptatjnl4vmiu/62680089013.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087810cd553b---weweror.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/trr08deatpehgcp1c3e1ktgku0/34249083783.pdfIn PDF document text
- http://firmykominkowe.pl/Obrazki/edytor/file/7859184545.pdfIn PDF document text
- http://bluecreator.biz/ckfinder/userfiles/files/71269611503.pdfIn PDF document text
- http://nessium.net/userfiles/file/zavizufevaregobasifoju.pdfIn PDF document text
- http://www.victoriousintl.com/new/resource/files/jakunaputoguwof.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f031f1189a9ebdab3ebf8457c935b134/vufuwogebazawe.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2a32df65470883d5127aa4fac5f72058/ribejogafumufa.pdfIn PDF document text
- http://lezeckastenakosice.sk/upload/files/renivuravapuxojume.pdfIn PDF document text
- https://go2germany.ru/files/file/filufuzelerezepa.pdfIn PDF document text
- https://abugfreemind.com/userfiles/file/12206632844.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9751e8040---45424822266.pdfIn PDF document text
- https://asthasupermarket.com/userfiles/file/91665554392.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d1733b836---7471493724.pdfIn PDF document text
- http://aucoindeshalles.fr/menu/file/ruvadubogosif.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gas+chromatography+instrumentPDF 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_off0000c7e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dff2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFF2	16636 bytes
SHA-256: `865bb60e272f940107b92579b2b813ffddb23370f906de027e841b7b806fa7d1`
`font_02_sfnt_off00010af9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AF9	11028 bytes
SHA-256: `4d46c2d104a31550fd68a53a574661c940b45f516ab02ef7364d590985b95cdb`

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