PDF malware analysis — malicious · 8f8d929185b193a5

MALICIOUS

PDF

93.4 KB Created: 2021-09-13 19:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f4f94ffe59c6d24baba66899f2dc24ae SHA-1: 5801a9d0aa8dfc64fcfb93ef64867721354da23a SHA-256: 8f8d929185b193a5367207be66d7b39e83d21fc9d134dc63e80c2c2310d3bd17

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, which likely serve as redirects to malicious content. The PDF structure itself, combined with the numerous external links, suggests an attempt to lure users to external sites for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=old+my+talking+tom PDF link annotation
- https://jhservice.net/imagenes/galeria/files/49714892217.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8719866b---58036162152.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad3501c977---98068195546.pdfIn PDF document text
- http://americasbestwingsbeltsville.com/uploads/files/nedarilodirudekoreduwipi.pdfIn PDF document text
- https://csn-alliance.com/data/files/nosisamukuzusurosojus.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb5f1c5614---bunujolopet.pdfIn PDF document text
- http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/dujekanuzuj.pdfIn PDF document text
- https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/timubevimo.pdfIn PDF document text
- http://mgbig.com/upload_fck/file/2021-9-6/20210906100821704153.pdfIn PDF document text
- http://vncdata.net/app/webroot/uploads/files/8053618012.pdfIn PDF document text
- http://studiotecnicodambra.eu/userfiles/files/90963936637.pdfIn PDF document text
- https://btcauction.vn/hinhanh/file/konujawoguxexoxeku.pdfIn PDF document text
- http://krukewittfarms.com/userfiles/file/xofositebib.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9d3afd86---18027393999.pdfIn PDF document text
- https://eric-parnes.com/ckfinder/userfiles/files/32160133979.pdfIn PDF document text
- https://eltonltd.ru/sites/default/files/uploads/mojimere.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99f6de89c---40569856124.pdfIn PDF document text
- http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zomemupekowaxokato.pdfIn PDF document text
- http://viorina-deko.com/images/file/25620393717.pdfIn PDF document text
- http://tubemakingmachine.com/uploadfile/files/73917560146.pdfIn PDF document text
- https://synersys.fr/contenu/file/93294876719.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bff849751---bapijawibigojog.pdfIn PDF document text
- http://aaronandanthony.com/userfiles/files/48661831704.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19884b961---vivegak.pdfIn PDF document text
- https://stmarys-perthamboy.com/upload/File/vivularazifamamezuvifad.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dd3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD3C	23544 bytes
SHA-256: `6619a46db89ac5c750da2b26e683aa1a61487f3ba0efa11fb26d090375d20fb4`
`font_01_sfnt_off00011972.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11972	10424 bytes
SHA-256: `4bde9370c8681e4aebc7d7e6470105da8ee78ad848234fa938bd5837bb3b6d5e`
`font_02_sfnt_off000130c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130C8	1680 bytes
SHA-256: `6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc`
`font_03_sfnt_off000138c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138C4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_04_sfnt_off000150d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x150D5	16388 bytes
SHA-256: `e8dcb5e5fbbc942b73626904f94c1dab99f4a70f0902c6d5c0e18a1168e25d72`

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