PDF malware analysis — malicious · e2a2b7c21183b30f

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 05:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 91a4adf95e8054e9be27ae385dc5724d SHA-1: dc2b7fd6798f504bd810932e1033f27551033e13 SHA-256: e2a2b7c21183b30f67469857baf5a2084c877af05829d2e108db3dfd2359a7ee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards a tactic of luring users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=recover+deleted+text+messages+android+without+pc+no+root PDF link annotation
- https://marathonroller.com/userfiles/files/31572874759.pdfIn PDF document text
- https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/poxan.pdfIn PDF document text
- http://15441707.com/data/board/file/20210911080313.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161369daa1d26d---96953498081.pdfIn PDF document text
- http://smolninskayahotel.com/userfiles/file/fexopamadusawomililusifot.pdfIn PDF document text
- http://parcroyale.hk/userfiles/27376154057.pdfIn PDF document text
- http://automotiveenergy.cz/userfiles/file/kedufaxedegomodawelaxej.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a3720ab6f0c9c6aed22ab3136444073d/vofuxomaxap.pdfIn PDF document text
- http://apcmagon.com/userfiles/13931642975.pdfIn PDF document text
- https://democv.associasuite.com/imagenes/contenidos/files/21418608862.pdfIn PDF document text
- http://irvinenott.co.uk/ckfinder/userfiles/files/butonopujobi.pdfIn PDF document text
- http://garantc.ru/userfiles/file/93589243850.pdfIn PDF document text
- http://advocaatindex.nl/images/uploads/13573510325.pdfIn PDF document text
- https://fond.ru/userfiles/file/jukew.pdfIn PDF document text
- https://egyediajandekotletek.hu/mvc/userfiles/file/giden.pdfIn PDF document text
- https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/522521f4bd0eaffaaa91d2e33d34be4f/31293908991.pdfIn PDF document text
- https://phuketwebstudio.com/ckfinder/userfiles/files/46241766619.pdfIn PDF document text
- http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92349180879.pdfIn PDF document text
- http://sinching.com/uploadpic/files/202109120401128565.pdfIn PDF document text
- https://girisimhaber.com/uploads/file/tutijoledazovaral.pdfIn PDF document text
- http://daiduongmetal.com/uploads/ckfinder/files/63973083746.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d855ea71---mukikedepitupat.pdfIn PDF document text
- http://bkmarine.net/ckfinder/userfiles/files/1631139124.pdfIn PDF document text
- https://vinocastillo.hu/editor_up/99608645294.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_off0000e194.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE194	17804 bytes
SHA-256: `cc19e9c774b7ef0acecc56b3327f7ca98e32e33c8788250c9d7d285df502eabf`
`font_01_sfnt_off00010f5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F5C	11360 bytes
SHA-256: `fb2e64d8b926890be0c0cac04fb2cfaaa938efeddbe26ab9d916fe80c6fd0f00`
`font_02_sfnt_off000129ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129CE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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