PDF malware analysis — malicious · 4f8e78d353901b1e

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 06:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 9ebb92654dde16b9cf7a4bc9ce88f925 SHA-1: c3f9bfb50d5284ef81f267ef072e16109f1f4759 SHA-256: 4f8e78d353901b1ed7c1e6b1f2879e5db0b8d1299d1dd28300e368a27d34b0ea

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links to compromised websites, suggesting it is designed to redirect users to malicious content or facilitate phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the analysis that the PDF is part of a link farm infrastructure, likely used for distributing malware or conducting phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 7

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.
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://infrive.ru/uplcv?utm_term=a+quiet+place+2+mp4moviez PDF link annotation
- http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614153931b7f7---wexororaf.pdfIn PDF document text
- https://sunsoftinfoway.net/ckfinder/userfiles/files/zevijotovu.pdfIn PDF document text
- http://chono.mn/uploads/userfiles/files/kewisekerabesejexexa.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2ea6ab012---wejuf.pdfIn PDF document text
- http://birizgardenhotel.com/userfiles/file/wagoronosexuwepotukuwumo.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409bdcad69d---jikizemit.pdfIn PDF document text
- http://atya.eu/files/file/ketuxakozinu.pdfIn PDF document text
- http://vhshf.de/File/44830549200.pdfIn PDF document text
- https://doublehair.center/upload/ckfinder/files/fiperodesemugajazef.pdfIn PDF document text
- https://medosojewellery.com/userfiles/files/zogevamevofibovolebovanez.pdfIn PDF document text
- http://donghotam.com/luutru/files/5621347093.pdfIn PDF document text
- http://goldsunjsc.com/upload/files/rumoralapej.pdfIn PDF document text
- http://circolonauticofavignana.it/userfiles/files/65336998211.pdfIn PDF document text
- https://alpasol.e-giant.net/upload/files/8962760916.pdfIn PDF document text
- https://gsacademy.ge/uploads/files/kezomubuzuwegidal.pdfIn PDF document text
- https://newchat.xyz/js/ckfinder/userfiles/files/74293447636.pdfIn PDF document text
- http://www.icareonline.net.au/ckfinder/icare/files/57958464204.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed5023cc0---55372900524.pdfIn PDF document text
- http://phuocthuan.vn/images/pic/file/sovadigep.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f770cf247---foroforagazigot.pdfIn PDF document text
- https://rajatotogroup2.com/contents/files/deregokuvenabuzagekefoge.pdfIn PDF document text
- https://etadelloro.it/images/file/tudusiwiwudotizuwik.pdfIn PDF document text
- http://richardchong.com/userfiles/files/jifajoz.pdfIn PDF document text
- https://viettincapital.vn/upload/files/31434976356.pdfIn PDF document text
- https://pensiuneavalentina.ro/app/webroot/file/xusulevawudijobegazowofik.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_off0000b4eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4EB	17288 bytes
SHA-256: `5c3dde97801522c9da061068130898d274de9f7269bbd74cbc4a44c711c19cb6`
`font_01_sfnt_off0000e163.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE163	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f97a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF97A	10716 bytes
SHA-256: `63d604a3c9d0d21a2478785d2c1c276b42c0c551b128187442002417fe319cf3`

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