PDF malware analysis — malicious · 659ed1478f4373be

MALICIOUS

PDF

77.6 KB Created: 2021-07-24 21:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8ea37e2a227f81a9b6514a5d332e8bfc SHA-1: 11bea7bad74181deb0506b933cf6b65afb00f604 SHA-256: 659ed1478f4373be9cc1e064283d67db2630b58f7947fff797ff24272fba84f6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially harmful content, aligning with phishing or SEO poisoning tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://jdrum-music.com/uploads/ckfiles/files/53722306991.pdf In PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd2258efe3---11159498883.pdfIn PDF document text
- https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/fb9004cebd62b1ebfa9a6304e81853af/51965731456.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8a7810965a74c4440b829354b539c247/kibipakonave.pdfIn PDF document text
- http://haumeaonline.com/userfiles/file/fipiwixadofefugezufural.pdfIn PDF document text
- https://jairdefreitas.com/ckfinder/userfiles/files/46396608694.pdfIn PDF document text
- http://blbr365.com/userfiles/file/1621462232.pdfIn PDF document text
- http://szguilong.com/userfiles/files/zuvuzelobuxu.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b66842b85346db94df5d88e88c2c8417/48966158392.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16084302c8eac2---wilubuxotikuzowito.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c71a79359---42925263945.pdfIn PDF document text
- http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/vilejezanaduridikaf.pdfIn PDF document text
- http://ratchee.com/ckfinder/userfiles/files/5005699812.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c03d653e7dd---zamebufirunure.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/liregefafitip.pdfIn PDF document text
- http://hvpeds.com/upload/contents/file/18694880259.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d69f459926def1f3734be82580992a86/42235269505.pdfIn PDF document text
- https://avigailpekelman.com/sites/default/files/file/93660131238.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075f45bbd1e3---69600155500.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7d368cc81---31009156028.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a906aeec---binizazuni.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3da4c3bdd2a7f7db757bce00cddc05e1/68158676114.pdfIn PDF document text
- http://konemara.hu/userfiles/file/sidokemomez.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qva3j40c7m6l6jaadlk9ck2ej3/wanimisanoniwiguwidigo.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3523b85d---genexulagerawupadat.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=skripsi+bayam+hijau+pdf+downloadPDF link annotation
- 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_off0000cbdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBDD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e3ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3EF	16272 bytes
SHA-256: `d4601c26bff920917363f8f72791e31f5f8e1e34f89474c4ed31ae29cccdc2d9`
`font_02_sfnt_off00010e00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E00	11268 bytes
SHA-256: `ceb2e18ebdd925078206b35592569dd1a8e65b110e74c6abc14e5098fd90a888`

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