PDF malware analysis — malicious · cb25ef3bbae86c18

MALICIOUS

PDF

97.3 KB Created: 2021-09-02 22:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 49b16406bdbab54951013ea061f5873e SHA-1: 92ae88281f1394df103f1c029eb8c7a37ac68b2e SHA-256: cb25ef3bbae86c18c5bdd6981ff482d3e7b23529d4e6a3065e70046f55391b36

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The file's purpose appears to be facilitating phishing or malware distribution through these external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9726

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://cructi.ru/uplcv?utm_term=ejercicios+aer%C3%B3bicos+pdf PDF link annotation
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160749e22d12ce---dobisisamawawolixubub.pdfIn PDF document text
- http://nwatchonline.org/userfiles/file/74537325383.pdfIn PDF document text
- https://prestinieurope.ch/userfiles/files/gukir.pdfIn PDF document text
- http://w-f-l.de/user_img/file/34501708585.pdfIn PDF document text
- https://purmoradiatoriai.lt/images/files/xuzolejuboxusutotuk.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e72471ac5---sifawebalitunatifibamek.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160836db49ebbb---rilofikodalexazopabij.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/373d3b20ac46d87caf0f34799e08a5b5/13491341577.pdfIn PDF document text
- http://csc0535.com/userfiles/file/20210727020230_og8y80.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741e18ea1b9---zukidomudotukafi.pdfIn PDF document text
- https://indiantalentjunction.com/milan/media/gokunegogufijodozugavar.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/wetibogakoxepi.pdfIn PDF document text
- https://autotrans911.com/thread/admin/uploads/file/74249014164.pdfIn PDF document text
- http://www.victoriousintl.com/new/resource/files/9499044467.pdfIn PDF document text
- http://sztarmedia.hu/_user/file/dogozonoxixemesivu.pdfIn PDF document text
- http://szyldkj.com/luodan/images/userfiles/file/kaxufirasopukuxu.pdfIn PDF document text
- http://mariamozharova.ru/uploads/files/vidisedujixasege.pdfIn PDF document text
- http://fatamorgana.fr/uploads/assets/file/velajuluxebajani.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102bef5518b3---gifirukuliwaziwugafadalu.pdfIn PDF document text
- http://allaboutdowney.com/userimages/bibanoxemipudinuzavonub.pdfIn PDF document text
- http://christschoolblr.in/userfiles/file/49973988843.pdfIn PDF document text
- http://shimamura-mail-order.com/userfiles/file/87621940364.pdfIn PDF document text
- http://vandientuchinhhang.com/upload/files/4954152611.pdfIn PDF document text
- https://abofahed.com/userfiles/file/kolitugedaze.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd0436e8d2---78590189261.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bab39ea0edc4b638d11d58c97741a437/67062665982.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off00015651.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x15651	18868 bytes
SHA-256: `7f49cc5153c56447dc1faae9805e7e05e374625d935a6c251060878d3be194bc`
`font_00_sfnt_off0000f346.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF346	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010b5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B5D	10756 bytes
SHA-256: `016133d2b9caf8e206eb4b78622606924e5edb84801481e43eb01907281e986a`
`font_02_sfnt_off000123ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123AC	19548 bytes
SHA-256: `07a654a73daf7af701f08534742ff63f1bf8e96068d0820b7267186c77381f17`

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