PDF malware analysis — malicious · 8b204c500ce6b828

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 03:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 2a9d3f39f91d26cd5798d08dc14d888c SHA-1: 5e3f72d43c8ba523ac7fe0867536f52477c49797 SHA-256: 8b204c500ce6b828b5da92c4bd4b5eb5b9b7abe48dc9d82f15ad2a2b7ff79780

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious purposes. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

Nyx PDF Classifier suspicious score 0.3891

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://nomylo.ru/uplcv?utm_term=black+hair+salons+near+me+open+today PDF link annotation
- http://meandnetworking.com/ckfinder/userfiles/files/pilusekekojajamijema.pdfIn PDF document text
- http://hoteldanang.vn/uploads/images/files/lapebifude.pdfIn PDF document text
- http://akiisushi.com/uploads/files/zixopuzokomiku.pdfIn PDF document text
- https://lockerova.eu/admin/upload/documents/binoduper.pdfIn PDF document text
- http://gaestehaus-am-erlkoenig.de/img/editor/file/96476395948.pdfIn PDF document text
- http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/1841371785.pdfIn PDF document text
- http://misterholidaysanprisco.it/userfiles/files/99631581263.pdfIn PDF document text
- http://tubesealer.com/uploaded/file/134870894461435d0993b19.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147c4cd23303---pojosaroriwamuzij.pdfIn PDF document text
- https://agentcctv.com/userfiles/file/65737766316.pdfIn PDF document text
- https://www.casestilistas.es/ckfinder/userfiles/files/fanixebu.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1d12d8e0---17327942653.pdfIn PDF document text
- http://archive-2014.humandoc.pl/attachments/file/32439163234.pdfIn PDF document text
- http://firewheels.pe/userfiles/file/tivexagilinewesezinusixup.pdfIn PDF document text
- https://www.aicsmindia.org/ckfinder/userfiles/files/fotisaxi.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1af054e705fc89c12f12485c6d17501e/41429524700.pdfIn PDF document text
- https://dom4m.com/userfiles/files/84981217732.pdfIn PDF document text
- https://dafelia.com/files/41863638617.pdfIn PDF document text
- http://zssadkowice.pl/pliki/95143871568.pdfIn PDF document text
- http://thuocnam.xyz/images/files/7537835307.pdfIn PDF document text
- http://gunjanjain.com/app/webroot/js/uploads/files/10353143538.pdfIn PDF document text
- http://hoilhpnqbthanh.com/upload/file/96791120617.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/xasisojulobaxukubenovaw.pdfIn PDF document text
- https://bbox.ru/images/shared/file/4436696355.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_off0000bcfb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBCFB	17208 bytes
SHA-256: `d7493bd88428be83eb66b8f51c696956e2a9a88ed66fb0cc9ab49a6813ce0e3d`
`font_01_sfnt_off0000e98f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE98F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000101a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101A6	11036 bytes
SHA-256: `a5b018fb4b38ad89a1abd7c62c52744af8866aa0a1c8604e8025a7652bfd393c`

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