PDF malware analysis — malicious · 2cf0785795f079f9

MALICIOUS

PDF

70.8 KB Created: 2021-09-07 02:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: cee0106ebe9d0f1c957822988bd3f25d SHA-1: a9f36fc4c4ae74c6273cf3ccfa18e7b357e4ed69 SHA-256: 2cf0785795f079f9674c64c5c95608f72dfd0537da55464322dff9b048a77149

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/6916533492.pdf In PDF document text
- https://olivierdaulte.com/ckfinder/userfiles/files/fobipexuzex.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e1b89fe0b02bc5d107aa52dacfa1fd5f/52210672986.pdfIn PDF document text
- https://kltccompany.com/ckfinder/userfiles/files/viraw.pdfIn PDF document text
- https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/683bde752e3e1b31b943e525812d8d2a/dekuvojejo.pdfIn PDF document text
- https://soechi.id/userfiles/file/49176714211.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6cb27e87537e8104449bc7db1a2ebbae/jopukipewirevixazu.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rd637qh1rrf7rdv3439qa543gj/59311716863.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/pqicahf1qjemgvkpmessfhj0a9/kovunuritamotilafox.pdfIn PDF document text
- https://reitinguok.lt/userfiles/file/fonoladinusisobejojitu.pdfIn PDF document text
- http://xinchenfast.com/upload/file/5213631597.pdfIn PDF document text
- http://fiumevivo.it/userfiles/files/sajujixelul.pdfIn PDF document text
- http://cs-web-design.de/ablage/userfiles/files/93533201482.pdfIn PDF document text
- https://www.hkha.org/ckfinder/userfiles/files/80578942502.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608e74c9e1ef1---9437062265.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b436a8c898---72101868459.pdfIn PDF document text
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b381d12be6003d1975e2883aa5a6b112/jifisuzijupusabenaduduf.pdfIn PDF document text
- https://intellicapital.in/ckfinder/userfiles/files/faluk.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160718a046e0e4---milokevapepimudawukapet.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9a77a35e6f03bda3686fdceb93a5312b/51020745633.pdfIn PDF document text
- http://poiskvod.ru/images/file/23797329012.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0884d14445---sixadodapikon.pdfIn PDF document text
- https://flyingfish-stay.com/userfiles/file/34004790227.pdfIn PDF document text
- http://epodhajska.eu/UserFiles/File/67397659421.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072001ee33cc---bezorubetogevobudaf.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=russian+migration+card+pdfPDF 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_off0000b90b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB90B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d122.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD122	10928 bytes
SHA-256: `57e588a7946b19a937121f824b5684ce8c61ac338d1415673a359652fdfff703`
`font_02_sfnt_off0000ea33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA33	14236 bytes
SHA-256: `1a667333288424349981519bb3d00dd95946834988ce41dfcf2523f2f2c12128`

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