PDF malware analysis — malicious · c4770f7a1c87cca6

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 13:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: b8c58c4b47e5234be9fa5e62b7d839ee SHA-1: 246cca031a7d2e55672a8cbef0f6dbe594c969d1 SHA-256: c4770f7a1c87cca62da87df095babc51b2a3d233af623a6a3d6c4347296e3924

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristics clearly show the intent to redirect users to external, potentially malicious, URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/umus2qd2n4dv4199qlhrtqm511/89048047671.pdf In PDF document text
- http://christmaslandint.com/userfiles/wifuloruzew.pdfIn PDF document text
- http://nuovartea.eu/userfiles/files/foxatoxorufi.pdfIn PDF document text
- http://amandamaitland.com/images/file/51348108340.pdfIn PDF document text
- http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/gewijopamaxev.pdfIn PDF document text
- https://ceccarmaramures.ro/userfiles/file/tuzelawiwofu.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/582306f4a3612d54dca1ac850c3347b9/rutirafiwiwurobalojase.pdfIn PDF document text
- http://gps-tw.com/CKEdit/upload/files/73719006618.pdfIn PDF document text
- https://songhong.info/userfiles/file/91832825374.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/78d18768875eeb1018717b63060739da/90958586061.pdfIn PDF document text
- http://ipsaix.com/ckeditor/ckfinder/userfiles/files/35490088495.pdfIn PDF document text
- https://speedwayinfo.hu/uploads/file/21059958508.pdfIn PDF document text
- https://media-get.ru/userfiles/files/85640423180.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff05b8aa99---20622899369.pdfIn PDF document text
- https://dacinsara.ro/fckfiles/file/18170441057.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f488a5d701---90997692918.pdfIn PDF document text
- http://weighlessthisyear.com/ckfinder/userfiles/files/warokobamidudunelup.pdfIn PDF document text
- http://beiks.info/public/file/73554092655.pdfIn PDF document text
- http://ppogrimall.com/upload/editor_image/file/rafaz.pdfIn PDF document text
- https://www.agcontraincendios.es/ckfinder/userfiles/files/benimidedoj.pdfIn PDF document text
- https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/98501856382.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/vobevoxikotomefojabubis.pdfIn PDF document text
- http://blueyee.com/upload/file/160503068185.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613762be80a80---79622808148.pdfIn PDF document text
- http://www.yt333.com/userfiles/20210914/file/1631571701.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=car+parking+enforcementPDF 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_off0000da03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA03	10732 bytes
SHA-256: `48478ab09af16aef9b8c53b0376667915b84dc74a8efa3fc8bb75e085fa486e7`
`font_01_sfnt_off0000f2b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2B3	17900 bytes
SHA-256: `c61e27297ab2d456c231085f068883bef707fc8b15d400fdcf9ac1d6933b1082`
`font_02_sfnt_off000121a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121A6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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