PDF malware analysis — malicious · 25fb24781ff715d0

MALICIOUS

PDF

88.0 KB Created: 2021-07-18 23:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 5d4f8f6894d05196dccd0a3627f5e34b SHA-1: 2f8ee9cf7eff8069f145038cfc7a948b5c2698a3 SHA-256: 25fb24781ff715d06f2bddcbb4942dfacae79cff1becaa183aa352d869270dbd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb6bd5719---47912162572.pdf In PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e2e2d36b---jiruki.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807479f0747---8883033018.pdfIn PDF document text
- https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/jvdv37hrs9nh0bcbs7pg8acabf/jepuxezuwadewudakevavum.pdfIn PDF document text
- https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2c01aaf7a5b101806966a79b151cc66/vamiguxi.pdfIn PDF document text
- https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/22bd7d445dc3d289473d28ad6d0c4428/lolaxasagolujevejir.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b13696fd---nixijofaloduzegogevunubom.pdfIn PDF document text
- http://paillasse.hu/userfiles/file/jifoduwagobapifevopiwig.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446d1ba91d---55406845665.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/33jonqvv4be31cgcvj7ghjo8lr/81886269840.pdfIn PDF document text
- http://www.evisiontiendaonline.com/ckfinder/userfiles/files/fizetajofep.pdfIn PDF document text
- http://kpotplace.com/uploads/files/fabajewakarabamakomolu.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893b2802ac7---13429945825.pdfIn PDF document text
- https://ikansambel.com/contents//files/12836908950.pdfIn PDF document text
- http://muslimofwestbengal.com/mwb/editor_upload/files/fonawemabavazugupoja.pdfIn PDF document text
- http://szzxwx.com/Upload/Upload/file/202163124979204.pdfIn PDF document text
- https://nepalonetours.com/userfiles/files/rokebaka.pdfIn PDF document text
- http://cherriestattoo.com/ckfinder/userfiles/files/rezefadofeg.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c46132f2a---waselisuvowozogofiva.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/u27ub4at0m4e9ir5j9segnec48/wononomonokonidigin.pdfIn PDF document text
- http://accronline.com/userfiles/file/kawavizewumilokevuke.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f8674a572---56178038460.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b13a6d8aeed---kedepididapenimulex.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6622a3009---15016854507.pdfIn PDF document text
- http://beming.com/ressource/site-image/files/dosezazuruxileripu.pdfIn PDF document text
- http://pnmanagementsolutions.in/uploads/72522455333.pdfIn PDF document text
- https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/9a2518648519705fa8cc3870b599399e/83076831876.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hope+all+is+well+with+you+meaningPDF 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_off0000f545.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF545	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010d5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D5C	10892 bytes
SHA-256: `8748fce16408472baf0deb846da630090127d0cfa64398c9ee2cae3290fc823a`
`font_02_sfnt_off0001266a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1266A	17136 bytes
SHA-256: `d6a5a033799a6393af78add3174c2ff4b95dea04fce08925d5705b3748b54499`

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