PDF malware analysis — malicious · 97ca80e9ece31a41

MALICIOUS

PDF

74.6 KB Created: 2021-09-11 23:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: c69f73f3f6d5bca824218bd0d2efe4de SHA-1: a2f095939fa31f3eaccdad5a892aa09b428202d3 SHA-256: 97ca80e9ece31a41cc8a41e96cdf2e7286a31af974faf97e8bd42d65d7661b89

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. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=lol+hide+and+seek+rules PDF link annotation
- https://samajsutra.com/userfiles/files/14303460232.pdfIn PDF document text
- http://liebherr-tr.com/userfiles/file/22347189266.pdfIn PDF document text
- http://antonio-pelella.eu/userfiles/files/farixusovekanogipe.pdfIn PDF document text
- http://tabletopad.com/images/file/75985279237.pdfIn PDF document text
- http://rtm-plus.ru/ckfinder/userfiles/files/javib.pdfIn PDF document text
- http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/bugul.pdfIn PDF document text
- http://medtravel.pro/images/hand_uploaded/files/33632937998.pdfIn PDF document text
- http://lube-stc.com/ckfinder/userfiles/files/govisopiromezorozexolopov.pdfIn PDF document text
- https://limsurempat.com/contents/files/95142178477.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f10f7ec62e5183676d6dbacddef2bed8/69324005692.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e76756585---ramefezudoxi.pdfIn PDF document text
- http://chelseacarpet.com/ckfinder/userfiles/uploads/93725507572.pdfIn PDF document text
- https://arnetbilgisayar.com/upload/ckfinder/files/gagiwamamiruzosukodo.pdfIn PDF document text
- https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7f0bb0d29bd6ee1b1db79151f40c60c5/31559774800.pdfIn PDF document text
- https://bongkartuantakur.com/contents/files/96267344297.pdfIn PDF document text
- http://s4l.vn/storage/ckfinder/files/29037017731.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613988fe94352---mutonaluragevedul.pdfIn PDF document text
- http://olynskiconstruction.com/pics/file/42296322047.pdfIn PDF document text
- http://regimhotelierbucuresti.com/images/userfiles/kovakitupapefofe.pdfIn PDF document text
- http://bugskin.org/userfiles/file/45557998390.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a40314de---94216418618.pdfIn PDF document text
- https://ms01bet.com/contents/files/gufuw.pdfIn PDF document text
- https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/zozavapulazap.pdfIn PDF document text
- http://climtech.com/files/files/kokewirutakataniz.pdfIn PDF document text
- http://brmxn.com/userfiles/file/20210906210939_a848ga.pdfIn PDF document text
- http://parentini.it/userfiles/files/14905855344.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_off0000c201.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC201	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000da18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA18	10396 bytes
SHA-256: `e665dcdf8df2f0145a62f95e07c0b9662a2783bc8acc775a44f9b83a6387e9db`
`font_02_sfnt_off0000f17e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF17E	17048 bytes
SHA-256: `d72368ae9ed0d89627f18d8e70faa6aa9c85fa3b6629c829a25d7b7e43bd42df`

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