PDF malware analysis — malicious · 84161aa57e15621b

MALICIOUS

PDF

85.7 KB Created: 2021-07-08 08:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 20ce0f112c689657c92b63d157f2311c SHA-1: dd70d013f96cba5754c47d07cb694d291775c595 SHA-256: 84161aa57e15621bfc80776f1cb491ca75bc5504a3189c402d9d0686e3c19b86

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The PDF structure and embedded URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://inwebjor.ru/uplcv?utm_term=north+american+museum PDF link annotation
- http://mazdooradda.com/userfiles/file/bujap.pdfIn PDF document text
- http://nw-line.ru/generic/uploaded/demetutapitefudegoxamazaf.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db82e4b8af6---7468810398.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160828113ec323---sirazatiluz.pdfIn PDF document text
- https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0a00be49b9364b900bc21f07b2b0e66a/nipitimukujun.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc360beea7---vabokiwepipesakamunu.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c008a74f338cf55adf6cd0e16f1e5f41/xoranawozorarogulebi.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba7086a7d---kodixel.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ed6915bdd---42409324268.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806c3c5515c---20546053469.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709ea8d10df---salefig.pdfIn PDF document text
- http://21cedu.com/pds/userfiles/files/29655812809.pdfIn PDF document text
- https://feldmann-spedition.de/pics/userfiles/file/4981640299.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/82a0314cc9fbd211560ab1d28a10e0a1/xosutapenamevadusuxi.pdfIn PDF document text
- https://binarbaidequipment.com/public_html/userfiles/file/98595503006.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160793959435f8---botefudujurevomuw.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/u2b7bef3lv3eq99fp22afn5hd6/84651743353.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090120804db7---52680846151.pdfIn PDF document text
- http://erdivigado.hu/userkepek/file/91263049804.pdfIn PDF document text
- http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/155630521.pdfIn PDF document text
- http://thegroverestaurantnj.com/userfiles/files/78874540677.pdfIn PDF document text
- http://location-appartement-venise.com/italie_documents/files/69358429767.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be388437eb---zosuporos.pdfIn PDF document text
- https://thaiahpa.com/flash/files/69021528733.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d82ce2d8---doxumusibanobezakoga.pdfIn PDF document text
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/aabf0dc38c8239594fb896ec526cd799/82452735814.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_off0000ecc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC0	17336 bytes
SHA-256: `133fd57d2d95dbaf21c8dda6a7011d3e1d5070e53201456771712cc139471992`
`font_01_sfnt_off000119af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119AF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000131c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131C6	10524 bytes
SHA-256: `b960b6544af72a8ad7f1d1c1dab57d20cc03ae4d9ee957ef550841b9b5715bb9`

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