PDF malware analysis — malicious · f0dc2e4c98a01e1a

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 04:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 1c24788857dfc4d4bf192258bbe6b83a SHA-1: 36e930d55b3e2514f0866943a335b2d0a86d95dd SHA-256: f0dc2e4c98a01e1ac2ee2e50807450fa727dae54235779e2441f22f1351175bf

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to link farms hosted on compromised WordPress sites. These links are likely intended to redirect users to malicious content, such as phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160fc03115b0e4---soxepuma.pdf In PDF document text
- https://thaiahpa.com/flash/files/33839649667.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/vbft72edned1v4rsfv28h5dhnl/jamoru.pdfIn PDF document text
- https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/128afea4e03426be4f071976acfb36b8/39870361476.pdfIn PDF document text
- https://tadimtursu.com/image/files/xirujeturuwunu.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6cab0313fd3441e85921732e0b186b9f/3722591598.pdfIn PDF document text
- http://viethanit.vn/hinhanh/file/34624137614.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c2f1f7a8a6da4ba2f8c51090602e9eef/67326951813.pdfIn PDF document text
- http://07-3739589.com/CKEdit/upload/files/legosarewonanuzuvumokera.pdfIn PDF document text
- https://appchecar.com/ckfinder/userfiles/files/xetadosebolixasuritedokek.pdfIn PDF document text
- http://vantaidongsaigon.com/uploads/files/90872210142.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a561b6a0---polav.pdfIn PDF document text
- https://fullgame.hu/uploads/files/88645132443.pdfIn PDF document text
- https://promobryansk.ru/userfiles/files/povesamagaxozeluxiva.pdfIn PDF document text
- https://bjjewels.net/nbloom/fckuploads/file/87284916618.pdfIn PDF document text
- http://glastergroup.ru/userfiles/file/gotogapofosetuwolememolo.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ff8154ad66acbcae52938bde09117aaf/63744762693.pdfIn PDF document text
- http://urjabatteries.in/userfiles/file/48542082898.pdfIn PDF document text
- http://aloeverajuice.cz/files/file/9373531147.pdfIn PDF document text
- http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca05b6151---famusixi.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae013916a4e---sosofobizekozubepefi.pdfIn PDF document text
- http://yjsyrj.com/userfiles/file/26392019568.pdfIn PDF document text
- http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/basevodigafobudajedafeg.pdfIn PDF document text
- http://runbo.net/upfiles/files/16253797381244.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=happy+and+gay+meaningPDF 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_off0000f366.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF366	18720 bytes
SHA-256: `d2c5ca48e26fb9a7a21b883710c9f8c45ef560edfab711fa91b56f468d2b413e`
`font_01_sfnt_off000123bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123BB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013bd2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BD2	10308 bytes
SHA-256: `9fdfd1280b63555d3265b589fa8a7dbc865b13d0eed7f63b417f1858cb855525`

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