PDF malware analysis — malicious · 4bc1428dc908a3ad

MALICIOUS

PDF

138.4 KB Created: 2021-07-12 22:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 8ac60772892097c4e3a07c62077fa204 SHA-1: efbc451faea8e74c4baa97ca9fbffc46c44f4e50 SHA-256: 4bc1428dc908a3ad7d96bb2cdcd08ac1195a108ef926f246866709a3cea40b50

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9742

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://cructi.ru/uplcv?utm_term=water+absorption+through+roots+can+be+increased+by+keeping+the+plants PDF link annotation
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789729a09f---59261190714.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c0da9b00aa234b3380f46946cd0ef00e/xixevifaxedegolokoleta.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ef90b8aff0e783e82b789c91d58768e1/37467489494.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ov8v15cp2f5q66crktdgnjeh8o/63290593737.pdfIn PDF document text
- https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/76f240416119409d9386c5e96d4e9aa1/1874395816.pdfIn PDF document text
- https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/fd039819114aeda739d3026768ef8bc8/wibabogodetubikusunikab.pdfIn PDF document text
- https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609293edee443---vatomudafikavoka.pdfIn PDF document text
- https://yuss.it/file/jirumojotibi.pdfIn PDF document text
- https://transpack-krumbach.de/_upload_bilder/_filemanager/file/jigejojusogaxuzudovefaga.pdfIn PDF document text
- https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/c791daf74ad9249e4aef5b2007d2ad12/ginavibolovapibuvi.pdfIn PDF document text
- http://www.pranabkumar.com/fckimages/file/50885208824.pdfIn PDF document text
- http://classicalgardenornaments.com/uplds/file/60732335250.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/152da6b44b28e5c2fcdd8b940b2d4df8/71352587364.pdfIn PDF document text
- http://cathyourhair.nl/js/ckfinder/userfiles/files/11061270619.pdfIn PDF document text
- https://francois-daulte.com/ckfinder/userfiles/files/10757057968.pdfIn PDF document text
- https://aimara-bg.com/userfiles/file/23760422125.pdfIn PDF document text
- https://lemanssrl.it/file/febotesitumebogatewawu.pdfIn PDF document text
- http://ahxxzx.com/userfiles/202105/file/94747212341.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f909271b80f838e97cd96f5d3abbf9fe/57800982394.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fa9f06a1d---59502918179.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c8d59c8ca---62038896245.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7666253303e251bba6a98771c583a815/52787095059.pdfIn PDF document text
- http://konditsionery-reutov.ru/upload_picture/file/defegakeditixodejowo.pdfIn PDF document text
- https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160978332a24e1---2868456463.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d1374d2a---76051880518.pdfIn PDF document text
- https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9cc5d7a3---6259253776.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/nonewevegijijejerukasi.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_off0001bc69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1BC69	17012 bytes
SHA-256: `d4c7a2eb725c52e0901938b6933311ea067c7e393152962254ae950ae271c63b`
`font_01_sfnt_off0001e8e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E8E4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000200fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x200FB	11232 bytes
SHA-256: `f8d24c065cd87bfecde2b8249fb7b8bf37c4306b08ac5c4fea295f83fbdd2e7d`

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