PDF malware analysis — malicious · fa31a0aa35eeed61

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 00:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: c573c5c632261de80a565b6591a4ed60 SHA-1: 9596730247a63e485c78d81b39f7572fac96dcc1 SHA-256: fa31a0aa35eeed61ef098793d4e619097524049325cb207ea2b1ad1440a193ce

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, likely to distribute phishing content or malware. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://garglob.ru/uplcv?utm_term=calendario+laboral+2020+bizkaia+pdf PDF link annotation
- https://kisikana.hr/userfiles/file/zojukesubuxiwives.pdfIn PDF document text
- http://fontanarosaserigrafia.it/userfiles/file/76680410478.pdfIn PDF document text
- http://pepinieres-soupe.com/userfiles/file/70440199869.pdfIn PDF document text
- http://phrabat.net/UserFiles/File/44357851342.pdfIn PDF document text
- https://cakenepal.com/userfiles/file/7432497682.pdfIn PDF document text
- https://thehouseproduction.net/file/dokozivugisonixas.pdfIn PDF document text
- http://crystal-lamp.ru/uploads/files/kasekanegawuxur.pdfIn PDF document text
- https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/37b96e82d0aeb6f03e3f55fbe36da433/80424917671.pdfIn PDF document text
- http://hndgyl.com/v15/Upload/file/20218161216492028.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c666ca4514---fejaluf.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd446d498e---74424543353.pdfIn PDF document text
- http://mg001.cn/upload_fck/file/2021-5-8/20210508132852135397.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ae0c9400c02402642994853f9aaa1f1b/67170997076.pdfIn PDF document text
- https://lorus.rs/files/lagufeto.pdfIn PDF document text
- https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/93afb8b8e704f2e07b6f39a3e2bbdce1/dipananamifemobinuzufe.pdfIn PDF document text
- https://swift-tw.com/lcc/upload/files/71600459347.pdfIn PDF document text
- https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/74src8etcf00ceb5oh2lto207e/seguselezepoxibekawosep.pdfIn PDF document text
- https://faltprasten12.se/anvandarbilder/70/files/85983959330.pdfIn PDF document text
- http://kolasinprevoz.rs/slike/files/keboma.pdfIn PDF document text
- https://0900107678.com/upload/file/nurosimatojibifaluworupi.pdfIn PDF document text
- http://www.cafeinca.com/img/public/contenido/file/1408857078.pdfIn PDF document text
- https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d5213f64211b02d7204c9878c492d4e5/78133147566.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f9d2c9eaddb22956c47a91847fc5eefc/48636305724.pdfIn PDF document text
- http://domainecomps.com/documents/files/54548260217.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_off0000cf64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF64	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e776.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE776	18712 bytes
SHA-256: `9fb23a5e6f9cf8d975395d2895367d07aff79e1db28a58e9738fa2cc9ad6d418`
`font_02_sfnt_off00011673.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11673	10792 bytes
SHA-256: `c6e5bb9de32dd7d40287d73f78a2fa8b583aaf6b4d3d726b6af45d6e683c7c98`

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