PDF malware analysis — malicious · 3e3b886779af15e9

MALICIOUS

PDF

81.6 KB Created: 2021-08-21 07:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6df0dac610a402d418669a4259f299ae SHA-1: 087247dc6abe4c64354e92d5a58b07f753a05b15 SHA-256: 3e3b886779af15e99e60c1732cc5ff43a7d188e34bde8c86fd6e471a6ca361de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

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://selapro.com.au/application/third_party/ckfinder/userfiles/files/tofovafig.pdf In PDF document text
- http://yuanyoujie.vip/userfiles/file/rofaf.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097826b51969---84918346882.pdfIn PDF document text
- https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acfb4747fce---37831598075.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h7v2fgl71oeprf22g3ve6qusm2/99408659531.pdfIn PDF document text
- https://soudurelauziere.com/upload/editor/file/gipifobunirazoxi.pdfIn PDF document text
- http://afghansolar.com/userfiles/file/346124312.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/596e46923c315fa513e29ee2fef1f204/kitix.pdfIn PDF document text
- http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/xeloxofotudexotodepafekup.pdfIn PDF document text
- http://akcompany.vn/uploads/userfiles/file/97132629312.pdfIn PDF document text
- http://jumpinfit.it/userfiles/files/gozowijopugobetirak.pdfIn PDF document text
- http://terralis.eu/catalogue_dynamique/file/8600414119.pdfIn PDF document text
- https://armagedonspedycja.pl/files/file/88774144147.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c884771ba53---64952916008.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a16360c53f---51514275137.pdfIn PDF document text
- https://beautyyaurient.com/editor_upload/file/51745018026.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6a24deeeca2831753abc9bd0fc6e29fb/fabokagud.pdfIn PDF document text
- https://miaousland.fr/ckfinder/userfiles/files/18484032671.pdfIn PDF document text
- http://interwork.sk/userfiles/file/96104701884.pdfIn PDF document text
- http://aite-materials.com/upfiles/file/fukupumotufitorexutu.pdfIn PDF document text
- https://greenfuturevietnam.com/Upload/files/50821800322.pdfIn PDF document text
- http://101balkon.ru/upload/files/buvuwubawanemirujuwalada.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c457be2d---87246519825.pdfIn PDF document text
- https://esperanzadeavila.com/fotos/file/35354659567.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5516cd77a32baaad1c412107bf8724e4/51627225641.pdfIn PDF document text
- https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e1233386099a83c34b74895c463fd846/82699145051.pdfIn PDF document text
- http://perles-del-beya.com/userfiles/file/36102424573.pdfIn PDF document text
- http://apvn.info/userfiles/file/88720785958.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+can+i+check+my+boarding+pass+of+indigoPDF 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_off0000d4b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4B3	18956 bytes
SHA-256: `41d7fa6730391449f487c514fde77ab27cc17ce1ed90963ed77ea97d7ba11f66`
`font_01_sfnt_off00010547.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10547	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011d5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D5E	11344 bytes
SHA-256: `9166c1927f136af1547536b1a5915d8d5bd9e03d0e7c0712e01813453abba40c`

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