PDF malware analysis — malicious · e13ef4c9432db6e2

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 22:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 60c67d7846c20934ea38ea8f3d1324f6 SHA-1: fb0866ac5a8e0ef53cc3252f2f5621a33a51724b SHA-256: e13ef4c9432db6e23da73833ae985b62dbe4557b1f3362692fa6a3ba88ad7484

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the malicious intent of this document.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://philabc.ru/uplcv?utm_term=math+tracing+worksheets+for+preschoolers PDF link annotation
- https://penzion-palice.cz/content/vemikinegunidin.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cd5aef26780fe05ef6f6567a71b38522/pevasomadegiketovuge.pdfIn PDF document text
- https://kaplaitalia.it/userfiles/files/fupunudijukunomeni.pdfIn PDF document text
- http://dinskayarealty.ru/media/file/54111418620.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d70aa82d6dd9e3241b94dbbb2b5546dc/6122771386.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/sewefumotavodobobisilu.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fa96c9b8---batadepolujep.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dr4a9ls6til3rnsrv7fjti7tj8/gezaredugalumikatusapetas.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mblq8dcsdr9q3v2l4ccpf01et7/87677114785.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd36e2f0ca---69783649973.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0fa97d95---11321082870.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dc230a973f3c324f6eee1d4a097eab54/56848440018.pdfIn PDF document text
- http://hndgyl.com/v15/Upload/file/202166046282870.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16100d41613a4f---78565453243.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/a92c729ab9c8066b301d194246ac4b19/36708182369.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/10a9a30d91e6d4ec2f98670e84214319/83078007281.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1074a5f89c---91381579373.pdfIn PDF document text
- http://sharon-barron.com/userfiles/files/tusirivatomoweluv.pdfIn PDF document text
- http://plafondchauffant.fr//img/user/file/92903496307.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_off0000d642.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD642	16736 bytes
SHA-256: `546abceae06a8b2932e7b9b000cf5cab390dbb9eef895fc341b2700b8df13171`
`font_01_sfnt_off0001016e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1016E	10928 bytes
SHA-256: `be4d6963030557eee62a583e0a68a9713be549dedfb01f8116bc394543ab4116`
`font_02_sfnt_off00011ad3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AD3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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