PDF malware analysis — malicious · bf3a1bbb3a1b7f15

MALICIOUS

PDF

89.6 KB Created: 2021-09-08 13:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 58df0a3cc64cd5fa68ba6069c86a942b SHA-1: 8936dcb3d65bae9a47aefe8648a26b217dafc4eb SHA-256: bf3a1bbb3a1b7f156d89455d9252699b3d97fa0eb125e4c869d893d9d87f516c

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple URLs, some hosted on compromised CMS platforms, which likely serve as lures or redirect to malicious content. The ML classifier strongly indicates maliciousness, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

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://crysiq.ru/uplcv?utm_term=l%27appareil+respiratoire+humain+pdf PDF link annotation
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/40b10e85da1cfd90c5e2f81c6e9b6cef/zelegujimukepapeminexu.pdfIn PDF document text
- https://marjoyunlar.com/calisma2/files/uploads/doluludegafuzedakozuf.pdfIn PDF document text
- https://baigiangtoanhoc.com/upload/files/guxazesubodugoluwuzizesu.pdfIn PDF document text
- http://sudeoksa.com/userfiles/file/20210905093454.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fd270fbd---91818177478.pdfIn PDF document text
- https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/69123108787.pdfIn PDF document text
- http://amghanoi.com/images/ckeditor/files/pujinija.pdfIn PDF document text
- http://wefocusdesign.com/upload/files/namifaxamaxo.pdfIn PDF document text
- https://olterus.net/contents/files/98067161631.pdfIn PDF document text
- https://costabravas.com/uploads/localidades/files/34028890555.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da81e5961---64378774209.pdfIn PDF document text
- http://pnmanagementsolutions.in/uploads/piwowarizunuzafipexoweju.pdfIn PDF document text
- https://mingyi-lock.com/data/file/userfiles/files/27745023664.pdfIn PDF document text
- http://apex-architect.ru/images/file/kefisabogeve.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/94ac77585094223810df5a5a870c85e1/9376968199.pdfIn PDF document text
- http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/37477561942.pdfIn PDF document text
- http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tibusefezomuzinipatesog.pdfIn PDF document text
- http://flyingfish-stay.com/userfiles/file/kigetul.pdfIn PDF document text
- http://lex.tj/img/file/84696601019.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d804a5130ee9e075cb72c045807205b3/13833078381.pdfIn PDF document text
- http://thecountryclub32055.com/userimages/kepopedetajore.pdfIn PDF document text
- http://dezmaster.com/userfiles/file/67177606560.pdfIn PDF document text
- http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7396c4e5---47479263536.pdfIn PDF document text
- http://art-ball.net/files/file/3932585590.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131136a40874---xoxuvud.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f5a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5A4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010db6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DB6	19072 bytes
SHA-256: `7df7df71e17579209d2769e7c09cbd7b778d5f60c5b35bebba79a47cb881e8b9`
`font_02_sfnt_off00013df0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DF0	10852 bytes
SHA-256: `4fc518ee94c57391b67e233313a8a0ed7d36a1446e6e54e8e48cfdc33d38911a`

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