PDF malware analysis — malicious · c6c83da1f803df0f

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 01:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: a36533e762470ea115aafb453a23cb47 SHA-1: e9cc2e9a43a01a40eab2bb7584c2aa7dc19bb29f SHA-256: c6c83da1f803df0f60410f9a16c4af934486d46a02807214685c6b1c523de81f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Multiple heuristics identified the document as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://sokolzgierz.pl/web/uploads/files/34910509001.pdf In PDF document text
- http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/4332096894.pdfIn PDF document text
- http://edanieltour.com/FileData/ckfinder/files/20210528_A9FC0310F3B705B2.pdfIn PDF document text
- http://studiosimonepantaleo.it/userfiles/files/80524401791.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08a19a57f---64281482201.pdfIn PDF document text
- https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/wukebelatujekos.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c987df2211---gamuwifabuvurekubajokon.pdfIn PDF document text
- http://zoncmswebsitebeheer.nl/files/editor/file/sedoliwagagepugoroligage.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecbd3498a6---dowigex.pdfIn PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/oi73okifg6kdbkardk7amkc1ot/bujajalitugewejedoxozutev.pdfIn PDF document text
- http://cke.hk/userfiles/20397345834.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/15656504849.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/84548945745.pdfIn PDF document text
- http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf7e3d35f---2764721036.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bpgtsvmuarrfobd91va867eaug/pimewa.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bdc481793bb1dcf2725c53099d159409/wepabisurofi.pdfIn PDF document text
- http://szao-spb.ru/images/news/file/vozatavurezobejaf.pdfIn PDF document text
- http://eltonltd.ru/sites/default/files/uploads/78772694739.pdfIn PDF document text
- https://bataretak.com/img/files/file/xukiwewuwazetuzemapoli.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21bceb43a---mutafofurobunefewage.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4228a170c---watexopobimulokewij.pdfIn PDF document text
- https://zoomkish.com/basefile/zoomkishcom/files/dolesinaniwemikirafakozub.pdfIn PDF document text
- http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b21af72c9e5---dugulepudavusaxaxarip.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855c3f78fe0---39415197135.pdfIn PDF document text
- http://ash-graphy.com/userfiles/file/vutifisejadaxarelefil.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737630c5b86---vonizojokewif.pdfIn PDF document text
- https://tortugafilms.ca/adminfiles/file/92782908791.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+causes+a+muscle+strainPDF 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_off0000ef13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF13	10468 bytes
SHA-256: `aa75a6c8b5449592034ee65b88c76080ed6e2b858688bfc8d59ee2e96cdb34de`
`font_01_sfnt_off000106a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106A4	17020 bytes
SHA-256: `6aae018f64a6f7c1f39d8ef02fc0abefa541e58707cbff384b9c975e4477b49d`
`font_02_sfnt_off000132af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132AF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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