PDF malware analysis — malicious · a9aa41d11b77834e

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 13:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 7be8c6b8504077056473faa693cc91d8 SHA-1: 75b2bcab76f763ef5ad4876e7df8191de9a7004f SHA-256: a9aa41d11b77834e9e26acf99d5aea92ff22526d4f74f02b2dc80fe4b3c693f5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 6

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.
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=steadfast+in+a+sentence PDF link annotation
- https://aartipalette.com/userfiles/file/nikupikamoxamapus.pdfIn PDF document text
- http://biotledlight.com/userfiles/file///womasirobapizokujofom.pdfIn PDF document text
- http://chandigarhdatarecovery.com/files/file/16593154184.pdfIn PDF document text
- https://africanresearchcenter.com/userfiles/file/jagonifivepevav.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/91c683be8787f7d1525f88fec028a530/2172622545.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486c325dc9---70493754781.pdfIn PDF document text
- https://saleskerala.com/ckfinder/userfiles/files/1050502419.pdfIn PDF document text
- http://hotechike.com/files/files/12016232828.pdfIn PDF document text
- http://unseretochter.com/images/file/torezekepox.pdfIn PDF document text
- http://gabinetortodontyczny.eu/userfiles/file/fogumuwuni.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090974aaef41---veluk.pdfIn PDF document text
- http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c6488a74---39601246417.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd023327e---75875828151.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/6b1fa37d19ee6bd39aec156d9329b4e2/dudime.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607919704d98c---somebowejefuvatojuzexuzi.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d12db24349---bivabogijudofate.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f32d00f232---getenawivejujinuti.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/da848145858eb58e5592b87612f94534/82092783999.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/006dc9f8d4809aae736b86a9a499d3f9/mafopikidinexofojojenoge.pdfIn PDF document text
- http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03dac73c93---66570950613.pdfIn PDF document text
- http://hrzservices.com/uploadfiles/file/65253477511.pdfIn PDF document text
- http://flexicourse.cz/res/file/26080682085.pdfIn PDF document text
- https://diaochue.vn/userfiles/file/73604201479.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6e382dea22c1d03113afbaf26dcc849c/bijagisu.pdfIn PDF document text
- http://phuocthuan.vn/images/pic/file/komosadefokipelisedaladi.pdfIn PDF document text
- http://sanarina.de/ckfinder/userfiles/files/kizaxufogufafaremenagini.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_off0000d629.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD629	18392 bytes
SHA-256: `643f8a5a8e66175a18670e3dfd82f78de2a557f512d462f2000ba5762408a431`
`font_01_sfnt_off0001054e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1054E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011d65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D65	10280 bytes
SHA-256: `a8a969a0b40360968aecb28a25199193f180e5deaf6d1757cb10b9e0527b0be5`

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