PDF malware analysis — malicious · 9615c7a192b97356

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 22:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 9a3b339fc2083cab7ec2429b1cc0e7ee SHA-1: 8ff330e69d92e110dbd9c054d154d2d309bb9421 SHA-256: 9615c7a192b9735650548e8c51ddf0c43d9fee7783b83db94ccb852d3d07a657

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 critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6d783b8e0552943c3189f0d9c7f6e4c3/zozigezumiwojedepugaren.pdf In PDF document text
- https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/96f33c86bcb937831749d9295f9c0ddf/fawanoduzeniwoxoboko.pdfIn PDF document text
- https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a2359fb05218599aa499206ab620d3e3/vusefepuvemokazasatigud.pdfIn PDF document text
- http://alliance-ltd.com/userfiles/58363105831.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d8f7d472---239303861.pdfIn PDF document text
- https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c1al5jvqbonjga9vru77kb6nm3/91744914742.pdfIn PDF document text
- http://petukmahaaaraj.com/userfiles/file/67843551786.pdfIn PDF document text
- http://stlukesmn.org/clients/17773/File/20287384710.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/24c05c1c18505a84532a921a223dbacb/xizezozuwoxelibova.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098200817021---31345414236.pdfIn PDF document text
- https://vili-al.com/uploads/wysiwyg/files/68661316944.pdfIn PDF document text
- https://mdteam.se/ckfinder/userfiles/files/jepiralamonebikixakikux.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f3bd7d7f9---27679675363.pdfIn PDF document text
- https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/26f9b2a585ada9b38d51e05418c12696/70409005981.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/6334036738.pdfIn PDF document text
- http://dolphinkorea.com/files/files/dureponilinonatosevirikix.pdfIn PDF document text
- http://dragonera.cn/admin/userfiles/file/39038219473.pdfIn PDF document text
- https://ratsimae.eemedia/contents/file/99644898075.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6c2a947c---topegi.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1585552eaa---nabunudopuriwaxanuw.pdfIn PDF document text
- http://ultraljud.nu/bild/files/7149411986.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d0392b63---97964752833.pdfIn PDF document text
- https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/74c889de39e7d355ae2447950aef2e8f/bujaxe.pdfIn PDF document text
- https://hostingalani.com/calisma2/files/uploads/68105640655.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c4c37a97e---kegidane.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bro+force+unblockedPDF 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_off0000ed23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED23	16604 bytes
SHA-256: `74ff42d1c68c98dab79e9691b52fbd7acb4f26aaed08bab92c2dfb94dd13b8c0`
`font_01_sfnt_off00011843.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11843	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001305a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1305A	10336 bytes
SHA-256: `04f47f5c9b949d1f8246ce11bec8490d8c8e640520d0a5d7a1d8f8874e6043e7`

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