PDF malware analysis — malicious · b03880647a5d64e6

MALICIOUS

PDF

89.2 KB Created: 2021-08-10 16:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: a79b066c09476be8387a61eae9d16fd7 SHA-1: f0533ae594118aeb74900a6183c7615501194195 SHA-256: b03880647a5d64e6fcde33a955ea41f718394ca5702a3fcfc35f9d3ab835670a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. The presence of numerous links pointing to compromised WordPress sites and disposable hosting further supports a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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 http://birzebbugastpetersfc.com/files/file/padipamagiferezusodu.pdf In PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4a4f467f918169fe155e27a292637df5/14776186496.pdfIn PDF document text
- http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16073329ca31bf---98464063066.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e6a58f9e5---66842154227.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f488128952---rosigogikinud.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f85941a6d793b551c9dc439aebb14200/35028063748.pdfIn PDF document text
- https://almuhja.com/ckfinder/userfiles/files/52417738913.pdfIn PDF document text
- https://arredamentigiacobbe.it/file/mojipesolidu.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff343e8c9---2838361309.pdfIn PDF document text
- https://anitt.in/ckfinder/userfiles/files/natibenilatovaxopa.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa412a6d36---6466096334.pdfIn PDF document text
- https://ehotelgateway.com/bot/ckfinder/uf/files/18049973752.pdfIn PDF document text
- http://bulongvungtau.com/media/ftp/file/tapadulikozajow.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160754bd7594ea---78465377777.pdfIn PDF document text
- http://mundori.com/js/ckfinder/userfiles/files/38255290078.pdfIn PDF document text
- http://kk-gorenjska.si/uporabnik/file/semavuwarojaj.pdfIn PDF document text
- https://zivotzaokny.eu/res/file/43152210224.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/af4d7a0cc483b679a8ddc2b08e239489/85008211295.pdfIn PDF document text
- https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3378a7ffc3ac60ad7b242d911c56c42a/54200740148.pdfIn PDF document text
- https://zagorjeadventureteam.hr/files/vavevufe.pdfIn PDF document text
- http://movementlab.dk/userfiles/file/50422267645.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22c9327722---45234067872.pdfIn PDF document text
- http://gokea.org/upload/editor/files/kirifamijurur.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a92019548dc14e7e2d544edd70f7b82e/fopuwuvorozi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=poultry+feed+production+business+plan+pdfPDF 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_off0000f93e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF93E	10968 bytes
SHA-256: `7ad63fa9a9cb9d04205fb33ef0dddfbb4facea8c42c8cee3cf24631edc4b8060`
`font_01_sfnt_off000112a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112A3	17000 bytes
SHA-256: `6bd1ccf496475f015eca01b530f8c1912e2c2dc4e40ff5ef74f1e62a291c498f`
`font_02_sfnt_off00013e71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E71	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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