PDF malware analysis — malicious · 6a481f486a6eb4e0

MALICIOUS

PDF

100.8 KB Created: 2021-09-08 02:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 9dbe664052f902bf99069a93bd6d70fe SHA-1: 0150e25d99c308304660783e5bbf675377a51efa SHA-256: 6a481f486a6eb4e0e456a431052078bbdf3c13d4044e87108f66e4fcdd7ee0e8

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to distribute links across many hosts, likely to evade detection or improve search engine ranking for malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier suspicious score 0.3652

Heuristics 5

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
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://allytemp.ru/uplcv?utm_term=servlet+tutorial+point+pdf+download PDF link annotation
- http://gdaniec.com/upload/files/36365804423.pdfIn PDF document text
- http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/47586154739.pdfIn PDF document text
- http://yevres.fr/ckfinder/userfiles/files/25131276587.pdfIn PDF document text
- http://fujavietnam.com/images/Download/gelebixenilug.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f504a56ba---xawedusodifoxopezul.pdfIn PDF document text
- http://j-club.eu/userfiles/file/lurogoju.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc2ac7431---29745783968.pdfIn PDF document text
- https://tavio.ru/files/file/6569189128.pdfIn PDF document text
- https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b29d0b01---mebat.pdfIn PDF document text
- http://jjmcp.jp/userfiles/Image/file/88412891401.pdfIn PDF document text
- http://kanomax-nsk.ru/images/51355978334.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161010a6b11292---jusenafazaxerin.pdfIn PDF document text
- https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/91b5e6880e5ee39dedcd2005ef1a046e/wufifubukapowulen.pdfIn PDF document text
- http://thaimassageboy.com/ckfinder/userfiles/files/pakivu.pdfIn PDF document text
- https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/62fd9aa8c4a555a6f24b8df52da49894/vetezoruduvagiza.pdfIn PDF document text
- http://www.centralperdana.com/file/fobimirugisozafasosasu.pdfIn PDF document text
- http://ontsgoi.shop/uploads/files/727941958.pdfIn PDF document text
- https://spcinternational.in/ckfinder/userfiles/files/pejoxubanituwerezedajigaf.pdfIn PDF document text
- https://ajitcoatings.com/uploads/64977273859.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d220d263---mefarulefis.pdfIn PDF document text
- http://canphantich.net/Images_upload/files/46641434754.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096039365e41---81346775818.pdfIn PDF document text
- https://juniorclublivorno.com/sitonews/images_upload/files/48530370212.pdfIn 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_off000134b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134B1	19472 bytes
SHA-256: `a0b7485ca35b6c3637d804ebc7a082dc88956aaaef5abaaaafa8fce16506dabe`
`font_01_sfnt_off00016818.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16818	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001802f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1802F	10648 bytes
SHA-256: `62dde58e2f808d47b0d9866bcd4aff8c0ef3b6e87a5cea632cac651d3b74bb5f`

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