PDF malware analysis — malicious · 1faa9523d2f4ee55

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 07:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e62b251869848a61083169503244872b SHA-1: b52356bd611c3f768bc7bfc47fe47fa4b8236cb1 SHA-256: 1faa9523d2f4ee550100aa8c97aa4f8234230f1d15470e7787f2caca9fc949c2

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs that form a link farm. These links predominantly point to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicates malicious intent, and the overall structure points to a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

Heuristics 6

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 http://yournamebadges.com/withyourdog/cms_uploads/file/jakofibosebikiduvif.pdf In PDF document text
- http://mjacz.cz/soubory/files/89118987487.pdfIn PDF document text
- http://www.clc-engineering.com/siteuploads/editorimg/file/43597646547.pdfIn PDF document text
- http://vpsystem.com/files/fck/54421325142.pdfIn PDF document text
- https://ladachess.ru/userfiles/file/52490245200.pdfIn PDF document text
- https://noithatkuongthinh.com/uploads/files/kupexaxuzakikanawojobipab.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6468899b---28183619866.pdfIn PDF document text
- http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/60651139580.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/abd9c2f05b37a116758c8bf9ee869738/46492048025.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161408f7646693---nemotipafejuzerapogu.pdfIn PDF document text
- http://bekescsaba.varosom.hu/userfiles/files/zazeza.pdfIn PDF document text
- https://sbsoftware.ro/admin/userfiles/file/70436460570.pdfIn PDF document text
- https://hamasataccessories.com/userfiles/files/97271395448.pdfIn PDF document text
- http://studionegro.net/userfiles/files/jutuwavazusekezonepim.pdfIn PDF document text
- http://ticketsperiodico.com/galeria/files/pejotasazawapelorevabupi.pdfIn PDF document text
- http://location-appartement-venise.com/italie_documents/files/18851411495.pdfIn PDF document text
- http://hongsung114.com/files/fckeditor/file/30002405536.pdfIn PDF document text
- http://about-dogs.ru/upload/file/42396081930.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9914aad56846c1b5eba6f8c817ad3f03/96608120091.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ssr6iaqnn00prboacagbm9l0d7/tadamiwevuxoburud.pdfIn PDF document text
- https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/mekidebenizemefot.pdfIn PDF document text
- http://emons-verlag.net/testarea/cwsCMSlight/media/files/81548111024.pdfIn PDF document text
- http://intproplaw.com/admin/uploads/file/56795263298.pdfIn PDF document text
- http://nbnjl.com/userfiles/files/fakezagefutiwuxa.pdfIn PDF document text
- http://werkschoenenverkoop.nl/images/docman/files/22237087872.pdfIn PDF document text
- http://kebirbeton.com/userfiles/file/zevazilemagazitigomir.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kgf+malayalam+full+movie+online+tamilrockersPDF link annotation
- 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_off0000ba43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA43	11044 bytes
SHA-256: `7417c38520fd893ea986c93f315a037ed2851af2d99754ac9b94841f9ccb75a9`
`font_01_sfnt_off0000d405.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD405	15856 bytes
SHA-256: `8f17fad8849326930c59fa2d3f4e864f5490d993d8967231f807cf859361b009`
`font_02_sfnt_off0000fca5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCA5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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