PDF malware analysis — malicious · e1d4bcf9ca859d3e

MALICIOUS

PDF

81.2 KB Created: 2021-07-02 07:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a12cb0205db0759c4ebaa48289cadffb SHA-1: 55ecf6ecf638c6512c73bb93e3f7bfdf82a6ecde SHA-256: e1d4bcf9ca859d3e188539c455bf7a65ef13f8e2c06dda67ff66e125d6a2b5b3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9933

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 https://garglob.ru/uplcv?utm_term=how+to+find+r+in+a+geometric+series PDF link annotation
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/3ihg79v7o0iussh428bqehd5o0/gegoxarapejekawelefupiz.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607311283b304---gadugufufajojopu.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b6fb62f247f139d173c52c50fbc87329/fufukitegapizizegubor.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e6d3fa6bacc787ac115220dfa6e7b13/limopoleji.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/10533072504.pdfIn PDF document text
- https://clinicscrm.com/img/files/19730166696.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2489ed4b8---9088923991.pdfIn PDF document text
- http://mobilenmr.com/files/files/zofozivitobu.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/edd2b9889fee387c30917a7263805213/93240616559.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7849cb6fe4250f5e814b454261181e54/84961556038.pdfIn PDF document text
- http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609015ad4979e---latozomuganovemafosaw.pdfIn PDF document text
- http://bioterapiazabiegi.pl/obrazy/file/51243603348.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160784b27bc7e5---52737897253.pdfIn PDF document text
- https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/a1240fbfd5b1fe291ed502042e27ca42/89644887016.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073783035295.pdfIn PDF document text
- https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/d954cb47050d704d3fdfd63fd21c85a6/75358739451.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f3fbb47920bc1764a8aacb45149eb474/1306285057.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rdqikg67k1cdglp32lsvoiu3od/6276202028.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894db335db9---69225962511.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2ef7a2b315ae3be71ef64b6b5fa02987/puneponopojitekafenotu.pdfIn PDF document text
- https://laplacedesstores.com/upload/file/74885336378.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a0328632e---vakibefororudevonowije.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf105bba5---livuni.pdfIn PDF document text
- https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/198374da621c063dd912b2c46dcf1c3a/labijukopo.pdfIn PDF document text
- https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/4033c5d4184e665f9d377e90f37532c9/xazomovixax.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c6e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6E9	10848 bytes
SHA-256: `bda5ef8ced49c6cfad475c4d6f86c3160e1200a1e32e426e164b87da4373452f`
`font_01_sfnt_off0000dfba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFBA	16084 bytes
SHA-256: `325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7`
`font_02_sfnt_off0000f4e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00010cf8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CF8	16088 bytes
SHA-256: `04d357a061501e24fd3304b49acf9b4c4abbd9744894bf96061f056929264514`

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