PDF malware analysis — malicious · da5d48ef44b7d70b

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 15:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9db0d1e8f0a9e4e4b629a98a8ffaeda3 SHA-1: 276ea4cddf887f6472dde28be330ca461d65ef37 SHA-256: da5d48ef44b7d70b0e48b1a33d14d14f54f818d7c632c2f2ec870b2791d1f066

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may instruct users to open a password-protected archive, a common tactic to bypass security scans.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://wastran.ru/uplcv?utm_term=pdf+cutter+apk+download PDF link annotation
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/73dbc703d4a647962afe8b9e82481bc8/60912065658.pdfIn PDF document text
- http://momsystem.ru/public/file/87606315568.pdfIn PDF document text
- http://isagenixmakessense.com/ckfinder/userfiles/files/lerivelafakezebezawav.pdfIn PDF document text
- https://ph2020.org/ckfinder/userfiles/files/7488693354.pdfIn PDF document text
- http://cortabellanews.com/userimages/80242532912.pdfIn PDF document text
- http://sinching.com/uploadpic/files/202109030922009726.pdfIn PDF document text
- http://annassteen.com/ckfinder/userfiles/files/jodivubusotixovot.pdfIn PDF document text
- http://1-sanya.com/blog_images/blog_/file/zomulotebudolok.pdfIn PDF document text
- https://speedwayinfo.hu/uploads/file/dujinotigevadetalujava.pdfIn PDF document text
- http://3e3i.com/UserFiles/file///81841747571.pdfIn PDF document text
- http://ambulatorioveterinariorigolon.eu/userfiles/files/dixosomalitulixi.pdfIn PDF document text
- https://sysyanginguvenlik.com/uploads/files/27130639430.pdfIn PDF document text
- http://bertrandetgastineaudesigners.com/userfiles/file/97350458050.pdfIn PDF document text
- http://goodfortune.hk/UpLoadFile/file///xegizepogebowuwumepuwige.pdfIn PDF document text
- https://www.mnogotrop.com/ckfinder/userfiles/files/wivonomunederagonak.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f530e299e2---81077521732.pdfIn PDF document text
- http://surausa.com/uploads/files/lukaxopuwosavupezizigekax.pdfIn PDF document text
- https://pinyardim.com/calisma2/files/uploads/junorivuvisinew.pdfIn PDF document text
- https://nhabe.com.vn/ckfinder/userfiles/files/wujenomisuwemelasubi.pdfIn PDF document text
- http://yejiya.com/userfiles/file/7650292962.pdfIn PDF document text
- https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zovisiwudalo.pdfIn PDF document text
- http://sabaispa.net/userfiles/file/xodumef.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/80128383539.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0128121539f2ba0a4a2e82e7dc7d2b15/9098430495.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_off0000e263.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE263	10632 bytes
SHA-256: `8b8d203784852e34e7064d6d938397a682e71bcdb838b3f04f95a080aa10a621`
`font_01_sfnt_off0000faf6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAF6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011308.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11308	18756 bytes
SHA-256: `401eecb2ac4419b1c50361794cd2840a2afba1ff4e64a8b7722bc0ab7eb8ad52`

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