PDF malware analysis — malicious · 4bf81b02efd006bb

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 03:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 89cbc0849d3ae1e7997113590f8665ad SHA-1: 8d78a4b6f66071465bb20a40ddfd5040e0c649a7 SHA-256: 4bf81b02efd006bbb104d3c4b64d0ed19ec1550d86cc0fdad6387aa2c70e3409

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://irlanc.ru/uplcv?utm_term=witness+letter+example PDF link annotation
- https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3576f774c25dcc67c2a0d377af359285/wanirariduwexosezu.pdfIn PDF document text
- http://cck-brno.cz/ckfinder/userfiles/files/37113253127.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ae59a8a94---10011008781.pdfIn PDF document text
- http://rymwid-training.com/userfiles/file/28855184034.pdfIn PDF document text
- https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ib7tndpfucr5ni45itu2p384ce/dasedixegamawofi.pdfIn PDF document text
- http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975a1907a06---35073774905.pdfIn PDF document text
- http://teenaramainc.org/clients/875997/File/sovagupuzezumavijigo.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca520db3cd---80818895256.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d05a4517d9---xupevikunuxizidata.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3aa00493ba968fe92650f3902e4fc473/16557492260.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b574f0e13---wigused.pdfIn PDF document text
- http://kaizousha.com/js/upload/files/munofulet.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/zokenidira.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b9fa98a284667976545e893f0987208b/30949651192.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160896ebac601b---tijanatarepalod.pdfIn PDF document text
- https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/sqeorkccgqk4b12l4tbudo41d1/7882955916.pdfIn PDF document text
- http://www.drivingschool-brno.cz/files/files/silirotugumejilezuwari.pdfIn PDF document text
- https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/f81shkhsp0blv9lkh9qpi802hk/jexafojarimekepaxizuna.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c3c00baf0455d6ce8132f01096e8ffea/panupisezi.pdfIn PDF document text
- http://dragonera.cn/admin/userfiles/file/43534808529.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf1e6d6f77---liketox.pdfIn PDF document text
- http://orchid-daikanyama.com/userfiles/file/tononiregigojeje.pdfIn PDF document text
- http://cpils.com/userfiles/file/91143570746.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e99295944a---32229684754.pdfIn PDF document text
- https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mmhtpoin84fk4ic2q871011lio/3436438208.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65cdedea93---99284823301.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_off0000f113.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF113	16220 bytes
SHA-256: `b7ca422fc0e8f8f1078877c50749cd7c8366fdf4dba6165c05a51ee05a1d27a6`
`font_01_sfnt_off00011aca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11ACA	10388 bytes
SHA-256: `236a5fa5c2e3d243128344df88858d2f49275460830fb1ed4c35cbce2d07459f`
`font_02_sfnt_off00013249.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13249	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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