PDF malware analysis — malicious · 4f90ff15e62537ed

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 19:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: c8a50f597cd2e04ed1db3434ca0cfce4 SHA-1: c0feaf87e5b5850f3a870b15eb9d4fcd455c87d7 SHA-256: 4f90ff15e62537edaf5e19fe338424a8b57a72dcbb1e315eb22ccbde669d049a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for initial access via spearphishing attachments.

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://catamma.ru/uplcv?utm_term=shortcutter+quick+settings PDF link annotation
- http://mosjob.ru/images/file/22885327854.pdfIn PDF document text
- https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/7d1ef3468b52c0b5e67644641ce7f860/pakugepuwidupiginedire.pdfIn PDF document text
- https://zzhqhi.com/d/files/71907672845.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/03ghqfpk0gujlbsdbrp6q0err7/patajolofigezubukosul.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a83080751a2---jukeka.pdfIn PDF document text
- https://anpheatingandac.com/nbloom/fckuploads/file/komibipegaxaliwokarewe.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea21956772---bepudijixa.pdfIn PDF document text
- https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/9bd6d1f76a94809956c314d3b3a03fc4/30835697969.pdfIn PDF document text
- https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a771fcf050cdc648a5437797eefcd3af/36185193545.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096a9719c902---2444919809.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160867f42348d1---65193582435.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/sowowarexebaruxunawodol.pdfIn PDF document text
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1hm7uv7e1kehgcr6f6qln0v0qh/60804155536.pdfIn PDF document text
- https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/168c0d3c9fb7d1a4a0d059854fb8980c/60954294203.pdfIn PDF document text
- https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5e5ecf71256036dd9f75ade451b49b82/lokemi.pdfIn PDF document text
- https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3f7fc7d303c9b2a77a9330fec13d755d/fasavitamefanudexeg.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ae24cdfa41cf43f521083347796f3fb6/dirovonunonategux.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/2lfj68dj4ltd7dfgd9l01u97c7/40666830952.pdfIn PDF document text
- http://vce34.ru/attachments/file/84004592689.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b0a6613e31ff019ebb927bb8b760c6a2/figado.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4d47b534---voseradasejikilig.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22dcfc9ab7---82066092209.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609846b4c7e72---xemuteferipawexeler.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/laneganos.pdfIn PDF document text
- http://medlab.webd.pl/upload/file/27582690785.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_off0000ec84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC84	10716 bytes
SHA-256: `ee452599eefa56109c807c4b896a5094a22e3999614b1254c76282784f57ef04`
`font_01_sfnt_off000104c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C3	17504 bytes
SHA-256: `4a5adb44c4f5a415d140eebe3e9f92232720eb0a60602871bada66f4c129c4f8`
`font_02_sfnt_off0001329e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1329E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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