PDF malware analysis — malicious · aea98488264e6c5c

MALICIOUS

PDF

89.2 KB Created: 2021-07-17 04:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 99d7f67ecc806fa2538644a07b38ff4a SHA-1: 9d0394c260de84e6d43e2eee73e4ee39239cbaae SHA-256: aea98488264e6c5c2766249f956e732039a3e5cb32633992a5c8be20cdefd5c2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to direct users to potentially malicious content or exploit kits.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608325347a1b2---40093271043.pdf In PDF document text
- https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/d48dae51d00e8dedf1bcb5f63e1f1df4/7023630309.pdfIn PDF document text
- http://galeriejacqueselbaz.com/userfiles/file/33203421416.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088da8eb559f---79981851672.pdfIn PDF document text
- https://jagominum.com/contents//files/sokiwilinulu.pdfIn PDF document text
- https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/04c9b02cfe2ae20e76ea9592e4ba3832/19660756174.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a33593a2---rilek.pdfIn PDF document text
- http://debandhelder.nl/ckfinder/userfiles/files/fasilag.pdfIn PDF document text
- http://hondatayho.top/img-ngocbao/files/wodir.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fcu5b9dsqfnhnahr1k67da1dhd/jerepupexof.pdfIn PDF document text
- http://bilafafafa.com/shopadmin/upload/files/90852386125.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae33b46f9---54048020232.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a43c0e8c62---pejug.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9db9e75bb8ca6987b73214b2861ac048/14026432821.pdfIn PDF document text
- http://modnyi-buket.ru/uploads/files/6223742957.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0e994tff0j8jgbo3urtko0bdco/36246280645.pdfIn PDF document text
- http://hasici-pristroje-eshop.cz/files/file/38092204789.pdfIn PDF document text
- http://obasekiestates.com/UserFiles/file/18684298011.pdfIn PDF document text
- http://iaestedresden.de/userfiles/file/70615231391.pdfIn PDF document text
- http://proxima-design.cz/files/file/kinopowenosowejanajesa.pdfIn PDF document text
- http://kaowei.tw/image/files/20210526_181224.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8769lk3erl73cep5m45b1gargo/tilafagokaz.pdfIn PDF document text
- http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704472c9368---dunetotomepuxoniwajixo.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f5531e1a---tuniviz.pdfIn PDF document text
- https://securitydm.rs/slicice/file/jabokodukigiduvasujekiriw.pdfIn PDF document text
- http://boothbayharborshipyard.com/userfiles/file/99444540043.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+witcher+3+enhanced+wolven+armorPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f106.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF106	10756 bytes
SHA-256: `5c861b0dc6ab83b5c320a7d2b7cb580897794cc8eef9e614ffa08b44b5aec9f3`
`font_01_sfnt_off000109a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109A7	1696 bytes
SHA-256: `28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae`
`font_02_sfnt_off000111b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000129c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129C9	17108 bytes
SHA-256: `6af4dfbec4f4dee2a506e2cd6e01137b3f635a09479b4d70e99675a6a9f2dc75`

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