PDF malware analysis — malicious · c97f7a3e398a4c81

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 05:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5cd98762eebf78fb0d7208c55e0f15bb SHA-1: 20e6edd3c22920c16c8c2f36a13047db58f40dd0 SHA-256: c97f7a3e398a4c81fd416710c96cfc37c1e4b803c524e4ca54f20b152d3c5ccd

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised or disposable hosting. Heuristics indicate it's a link farm designed to redirect users, with one URL specifically targeting a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://malmospelmanslag.se/userfiles/file/23673127445.pdf In PDF document text
- https://1877painters.com/FCKeditor/file/bavewebekesafapi.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/8afd661fb498f8b712334f4592a7ddcc/nepegesofegojukijasajew.pdfIn PDF document text
- https://rockeit.com/userfiles/file/woxikuvepojulomegef.pdfIn PDF document text
- http://klinok-saintp.ru/files/5967059767.pdfIn PDF document text
- http://udokutscher.de/gfx/userfiles/files/fobomiwobez.pdfIn PDF document text
- https://full-flavors.com/img/Data/file/6076863862.pdfIn PDF document text
- http://sinners-party.de/media/file/70207741795.pdfIn PDF document text
- http://cga82.com/admin/File/jiwokumubewiribekusaxo.pdfIn PDF document text
- http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/e7ilsbqtpvcbb2h1t9dp5o0qf6/59946586485.pdfIn PDF document text
- http://specialcats.nl/media/files/bezuwebogoxuvo.pdfIn PDF document text
- https://newshieldinsurance.com/demo/gsa/final/images/file/87782936385.pdfIn PDF document text
- http://oryginalnedekoracje.pl/userfiles/file/novejelematiwameji.pdfIn PDF document text
- http://speed-r.com/js/upload/files/45884238307.pdfIn PDF document text
- http://angelofthewinds.net/ckfinder/userfiles/files/galase.pdfIn PDF document text
- https://cowichanseniors.ca/userfiles/file/luvesodemawotejekerevogi.pdfIn PDF document text
- https://hijaulumut.com/contents/files/dixojudisubub.pdfIn PDF document text
- https://pingthye.com/userfiles/files/3684109588.pdfIn PDF document text
- https://okazdedziecko.pl/_files/Media/file/42980616047.pdfIn PDF document text
- https://cqhuaan.myhost360.cn/upload/files/09-05-00-18-01-44.pdfIn PDF document text
- http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613506a85930a---85365894267.pdfIn PDF document text
- http://hurtowniagrafit.pl/userfiles/file/46061063427.pdfIn PDF document text
- http://anael.fr/fckeditor/userfiles/file/fejuletozijujututafubita.pdfIn PDF document text
- https://balajihighfields.in/userfiles/file/33783683960.pdfIn PDF document text
- http://happyhanool.com/ckupload/files/dojesidokopozojaje.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=guru+granth+sahib+translation+in+punjabi+pdfPDF 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_off0000c6f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6F4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000df0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF0B	11052 bytes
SHA-256: `1a6d12c4c04ae6fbe2e0d9db6edb237bd77abffa405fcfb522cc0fd6fd5a2c09`
`font_02_sfnt_off0000f82d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF82D	17656 bytes
SHA-256: `4befffcc36972cae2e7bf51794afc95ea13ecaa5e83f7120870ac5d7ad74ee77`

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