PDF malware analysis — malicious · b99c4c34c6cac57e

MALICIOUS

PDF

90.3 KB Created: 2021-08-05 01:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: aed8b0131cdb05b2f0281216e868a582 SHA-1: 916530216416eb1596233ad81b03bd9a20c139c3 SHA-256: b99c4c34c6cac57efc1b24cc240d7c5352c012703b785d983fce8a7defbeb895

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised WordPress sites and utilizing 'formcraft' plugin uploads, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign context.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=hkey_local_machine+software+policies+microsoft+windows+installer+disablepatch PDF link annotation
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2400d2540---xiwoxopeg.pdfIn PDF document text
- https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/77af1ba27599a66da25a50a05dad7062/mubufe.pdfIn PDF document text
- https://stef-nancy.fr/upload/document/5098500046.pdfIn PDF document text
- http://asdgolfclubtoscana.com/writable/public/userfiles/file/mizidalaxiru.pdfIn PDF document text
- https://rumusjitu.com/contents//files/jexumorifo.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ee426262---38425622958.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe1d3990079---zumapubi.pdfIn PDF document text
- http://acrclubinversores.com/files/galeria/files/tevufotupasugipibuvod.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5311e1c4b5---84851339926.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3d8d9681ebe6e1562e1b8f200759296d/vinuxinebelisus.pdfIn PDF document text
- http://nppgursaraijhansi.in/ckfinder/userfiles/files/97675842395.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/29ik00nfcsbltppmnh6enoiisr/52785711773.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/71691174984dd6e8e2620671aea37005/puxomudakogij.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2b076ff6---69058993516.pdfIn PDF document text
- http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/jatewodasakeza.pdfIn PDF document text
- https://ms01bet.net/contents//files/82895606913.pdfIn PDF document text
- https://yellowstonewildlife.com/43115789013.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1621202843.pdfIn PDF document text
- https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d0c3ca558dee80aae962f18a526a3275/9928134944.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ggols288di8h912vu0ot6pvg21/2164807088.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4ee681d9---89489809518.pdfIn PDF document text
- http://siembra.me/uploads/files/14037037144.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/81008bf0308ffb71a225b5dbd8c86055/9810056625.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_off0000fa9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA9A	11340 bytes
SHA-256: `10237d0c0b05704dd95d15e0acca511712852ab6304dc6cb944f9f76883ddef1`
`font_01_sfnt_off000114e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114E8	17316 bytes
SHA-256: `dd4d8f0159114054b70c9329293f290683f8cce82e0ad09999c8e850aa648b5d`
`font_02_sfnt_off000141f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141F0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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