PDF malware analysis — malicious · c5af4861cd832552

MALICIOUS

PDF

94.2 KB Created: 2021-09-02 20:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 95bbd4dce0a8923209b978097f17683d SHA-1: ec26424f44a3bb9c5ad98471938d77a5729ef460 SHA-256: c5af4861cd8325527797c3daee1b21b467962eb7e7b9bcb8bd62b86ff52df8c7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs indicates an attempt to lead the user to a phishing page or to download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=chauffe+eau+thermodynamique+atlantic+calypso+pdf PDF link annotation
- https://bd-sokolovska.eu/userfiles/file/jazor.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3faf161f9---18556960175.pdfIn PDF document text
- http://highspiritsmusic.com/ckfinder/userfiles/files/zexemawavudelog.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19680e5992---98538249860.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ff8c3ffa---bevenijopovijewu.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c71dbec43---4943195200.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4340dc4f9af41372675228657f8b0a4b/60098115745.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080acce78809---radog.pdfIn PDF document text
- https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qedhamsunam23liemapano07fm/nisexilop.pdfIn PDF document text
- http://senseoftourism.dk/userfiles/file/62787185102.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2688b1e8c5---95961410130.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbb7ab12f4---gekadixugot.pdfIn PDF document text
- https://dildendilecevirievi.com/upload/ckfinder/files/xatulo.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160738a4f79fea---9986249165.pdfIn PDF document text
- http://kayamedbursa.com/userfiles/file/36818643610.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a2828d51---2039014331.pdfIn PDF document text
- https://toromecanicorodeo.com/files/69057455136.pdfIn PDF document text
- https://akproauto.net/nbloom/fckuploads/file/faguvudanadibisok.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c089d301---jemobife.pdfIn PDF document text
- https://childprotectionindia.com/lexcyberia/userfiles/files/51651587631.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/38961913640.pdfIn PDF document text
- http://kaies.cn/upfiles/210603164002567171y36e72.pdfIn PDF document text
- https://semagro-msw.ru/pics/images/file/daxejawutotawiwexoxere.pdfIn PDF document text
- https://telorgabus.com/contents/files/4915708551.pdfIn PDF document text
- https://lotteppta.net/beta/assets/file/lomiludegikipenason.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_off0001067e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1067E	11276 bytes
SHA-256: `c232a837099fae90b40109b906289e0b45aa12121c0d925044f8a7798355fea9`
`font_01_sfnt_off0001209d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1209D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000138af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138AF	19160 bytes
SHA-256: `cfa000416d70ced3aaec8ada23cae7446c0ee3d072da844248a6492f66f8af47`

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