PDF malware analysis — malicious · ff5d05862a46b0db

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 10:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 1381f910a73648522c6829975fa6ea81 SHA-1: f67e2bcb371962380f210efa0b8157af414a9841 SHA-256: ff5d05862a46b0dbbc78a48577118d5c9864756ecbb5fd3c08f90c17f95d0f73

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. Although no scripts were explicitly extracted, the nature of the link farm and the heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

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://chcial.ru/uplcv?utm_term=well+of+ascension PDF link annotation
- http://hondatayho.vn/images/ckeditor/files/8437042929.pdfIn PDF document text
- https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/udkfpv8a546dq0oqqkf1sececg/semawuniran.pdfIn PDF document text
- https://nasikampung.info/contents//files/vopirulud.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3bfad8ec593ad8bcba6a17702bb5c6e0/60894208910.pdfIn PDF document text
- https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/98db1000f8b8a099d0413bbdd2dc7606/59982104381.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d217eefe818d2a6d7f3d9f804f63219a/92774353921.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/83837197cc9f8102ec49bf5cb86473ff/pokofebabe.pdfIn PDF document text
- https://amatnieks.lv/pictures/image/42324577347.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc63422c72---86820802706.pdfIn PDF document text
- http://ceskylakros.cz/userfiles/file/62123482811.pdfIn PDF document text
- http://shinies.ru/img/lib/file/57520212055.pdfIn PDF document text
- https://roweryelectra.eu/app/webroot/uploads/file/1620320050179.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ae6qsu16j8cs0sbmspbl2v6r1p/9799099950.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076e71da8d66---xexon.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ad0140c3---milakuniwuno.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e450df3d---fotepumedano.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ac6e1f9edb8b83c7cfadbaafcc6f6583/salimuzuxapapesunola.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d541b98e434e3ded2c99ee04974e172a/31074440469.pdfIn PDF document text
- http://moto-bike.pl/userfiles/file/jifapure.pdfIn PDF document text
- https://thefertilizergranulator.com/d/files/wazozanixonataweporapuda.pdfIn PDF document text
- https://ladangmimpi.com/contents//files/77878526634.pdfIn PDF document text
- https://bawwabatrizq.com/userfiles/file/90134023113.pdfIn PDF document text
- https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/38f66dfb7781928d537df8ba027bc44c/gonamipelodezotoxigijomeg.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cece656ac---jiburokaxemidop.pdfIn PDF document text
- http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9d67a1e6f---9781393746.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_off0000ee86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE86	16780 bytes
SHA-256: `1f23f041db98506bbb9617f4fe7f4b4c27b78d94ec87a72ed15ad19f417d203f`
`font_01_sfnt_off000119fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119FA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013211.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13211	10124 bytes
SHA-256: `228665d3c118506fb789c6eb5cd111c0b829cf8d71b8ca514205bb3116f5e563`

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