PDF malware analysis — malicious · 03d66161f0cfe27c

MALICIOUS

PDF

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

MD5: ce98a5f5a43654151f962943558d41ba SHA-1: fd99bc414e7f8cb53beecb4d09346cfeacff7456 SHA-256: 03d66161f0cfe27ca5f1aac729931bb9f9043d1a156effa30ed6d1a27275f8ba

126 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. It contains numerous links to external PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure itself is also indicative of malicious activity, with heuristics flagging external URI usage and compromised CMS upload links.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 5

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.
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 http://bright-mineral.com/uploadfile/file/2021051709502740.pdf PDF link annotation
- http://tamker.hu/userfiles/file/75166970170.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/cb88875295dc7e50d72320f959eaf7da/bosumufudilebute.pdfIn PDF document text
- https://tsafar.ir/basefile/tsafarir/files/29895998783.pdfIn PDF document text
- http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/wuwisuwanubujejivis.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/febfcf2216131fee6d1843cb5430d264/faleboseniw.pdfIn PDF document text
- http://phongkhamducphuc.net/images/files/55609687136.pdfIn PDF document text
- https://sankohomestay.com/userfiles/files/61876796773.pdfIn PDF document text
- https://www.rougeindigo.com/ckfinder/userfiles/files/buxovuzidimaz.pdfIn PDF document text
- http://argyleliquidations.com/userfiles/files/kexugepit.pdfIn PDF document text
- https://suacuachuyennghiep.com/uploads/files/64490345868.pdfIn PDF document text
- http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ec2e1ec39---67801469024.pdfIn PDF document text
- http://velocimapper.com//webfiles/file/68580226347.pdfIn PDF document text
- http://multi-accueil.fr/ressource/site-image/files/mirulisojebado.pdfIn PDF document text
- http://www.anieliasfx.com/uploads/textareas/file/jejefinazugeler.pdfIn PDF document text
- http://agcslohian.com/userfiles/file/31527331075.pdfIn PDF document text
- http://diysmart.net/userfiles/file/feposalonogusikonifanam.pdfIn PDF document text
- http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/rexuv.pdfIn PDF document text
- http://limuzine.md/userfiles/file/3688740009.pdfIn PDF document text
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/f816ab106100e0f8ebc38bcef759ef15/lorebodalukozufumojomef.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a4bbf35560142877c72279f17c9e825d/76549590926.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ec563bc247a8fd1a67ea5fd1c4c9ad46/37012885605.pdfIn PDF document text
- http://intertribo.sk/files/wupizaxinojixasipaxum.pdfIn PDF document text
- https://perfecthospital.org/FCKeditor/file/xepefukajelulikenosovo.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_off0000de2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE2F	17780 bytes
SHA-256: `26d85b9db04ef0b974e6af0381f57745dfb1fe1a973cd56b07db8f94f01cd41e`
`font_01_sfnt_off00010c09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C09	10720 bytes
SHA-256: `20b087c03989418c84b41f8bbb8729a261f6bfccbcfd30cdc8b6db0ce494c153`
`font_02_sfnt_off00012473.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12473	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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