PDF malware analysis — malicious · 83de89524145d8f6

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 20:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b1f63183cd6ba2dc3c44cc37665efa4a SHA-1: c83b1128e0142d6b9bd916abb3747a0f9a9f6ba1 SHA-256: 83de89524145d8f6b94acac099e6a1d006ad0bda4c2b9e59d916b501b9a40da0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to untrusted content.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=ducati+hypermotard+821+service+manual+pdf PDF link annotation
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d350caeb2c6821dbd08eaa920e4483ea/25293609471.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bab58150114---71198755013.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe17cd923b---46311411839.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/75d5b4dea3845c6f304ba6cdb5e29ff9/2835211288.pdfIn PDF document text
- http://adbuilder.at/ckfinder/userfiles/files/47309087397.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d65500bed350b78376b7b851821d271f/22058453961.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/15338101290.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d7da0a8bb---luluzip.pdfIn PDF document text
- https://magatek.com/documents/file/gidenutibemote.pdfIn PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfb65c1e8---xasax.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3b912e7bae160a470cc49cdbdc9141fe/bawogiluz.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332f5581810---92486773256.pdfIn PDF document text
- https://lederstuehle-shop.de/ckfinder/userfiles/files/45399533452.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e97196afc---81989260763.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5c297f36---limebagilevakexu.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd6c75588---sabinexanudevozolinixaj.pdfIn PDF document text
- http://goodmax.ru/i/files/28859721130.pdfIn PDF document text
- http://vce34.ru/attachments/file/padizopugubolibewezito.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e3d00f1e---zofetudomizufubezerib.pdfIn PDF document text
- http://emirates-offshore.com/uploads/image/file/goboputarenenabibew.pdfIn PDF document text
- http://101-games.ru/images/uploads/files/38669212382.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/g3kmcq8uof3juotgglgm7nfdn4/minonewunif.pdfIn PDF document text
- http://resortvillairene.it/userfiles/files/4526446808.pdfIn PDF document text
- https://benhgout.net/uploads/Files/file/mupobasudutosirevames.pdfIn PDF document text
- http://www.kigimex.com.vn/ckfinder/userfiles/files/kipemosukam.pdfIn PDF document text
- https://yssnewlessons.org/UserFilesTwo/file/tejodemavuxamela.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_off0000c2bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC2BD	16940 bytes
SHA-256: `02e5801928b5eb7893d055ea70ae2ab6bcfdb9ae34f4bc9b8e283eb166c91322`
`font_01_sfnt_off0000ee8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE8C	11548 bytes
SHA-256: `7b9d86e831ad7b6eb5985a6e5d3217af6249ff79d021413f42907f19566d78ac`
`font_02_sfnt_off000109f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109F6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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