PDF malware analysis — malicious · 4c200d82ab1d08a1

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 05:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ffe63a54fa5e0da8f93cb167bbccafd5 SHA-1: 17120c0c94fa91b88f63436ddbd0bbd7f4b4f512 SHA-256: 4c200d82ab1d08a1ad2964e4fb623dc6eb94ad91d16af4cae4c995bc7d0c2158

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, specifically identified as a phishing trojan by ClamAV. It contains a link farm with numerous URLs, many hosted on compromised websites or disposable domains, suggesting an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted, but the presence of external links and the overall detection profile strongly indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://jotelek.hu/files/file/82078270195.pdf In PDF document text
- https://medtek.vn/storage/file/22344313023.pdfIn PDF document text
- https://svarovanijelinek.cz/ckfinder/userfiles/files/68628787172.pdfIn PDF document text
- https://sanxuattrucauthangkinh.com/Images_upload/files/xutinaxug.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dk1vscstk0opiv4qmt245p9b7r/karobegadasufuti.pdfIn PDF document text
- http://aokisuper.com/ckfinder/userfiles/files/farofopuvipozuteg.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c3820611de72913336df67fc94799177/79078117231.pdfIn PDF document text
- https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/73394054887.pdfIn PDF document text
- http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/gafisuwamabimafuture.pdfIn PDF document text
- https://cartolmania.it/file/ragobojegobarudijuw.pdfIn PDF document text
- https://booknowrentalimo.ch/userfiles/files/42898493848.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d56695ace35d31e818edc5c45779a3f9/jidopufug.pdfIn PDF document text
- http://akvari-um.ru/userfiles/file/57813539881.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bd37e6e045e50110970ea2931637e237/25083733544.pdfIn PDF document text
- http://33podarka.ru/pictures/files/fajavonododozafuroxigon.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075786475a69---52889753632.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8b650ff56e0a8850bb095e698285d3c/34294389845.pdfIn PDF document text
- http://pathtojanna.com/userfiles/files/95936358233.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d91e0ea72---pevijebesuzajomojuwamo.pdfIn PDF document text
- https://kozhikodedeaf.org/admin/my_files/file/52773849113.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a444d357c---mawetusupakepirixun.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609926a116377---96492200840.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100ba49a9cd4---35956798338.pdfIn PDF document text
- https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ges6rcdums6aac194dvshr4n2a/zipogatebasajuxobapurozaf.pdfIn PDF document text
- http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/72rgfrs7t3noad26p0cgiuqoc3/30497239494.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/09d4333c19d331f51779f074bf40da0c/bajatinekuromuwix.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=subtraction+worksheets+grade+1+freePDF 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_off0000e043.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE043	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f85a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF85A	11252 bytes
SHA-256: `e87fd59a245e741d2c5c930f76e6e01dbdb11ba2f87f53db31dc493f56509f68`
`font_02_sfnt_off0001129b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1129B	16612 bytes
SHA-256: `eddff657610e2af7bbeda2d8cb8a75c96099944a893fa85ae04097fef7f1b9c7`

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