PDF malware analysis — malicious · e21cc671f10b5056

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 00:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: f60040c19aeeeb2986ae575f99829e16 SHA-1: c2c8c59c4812240ebffa49deb8e4baef52680a0c SHA-256: e21cc671f10b50569a6758da7bf56b6882ed66f2fe1c3c7fe05932c81677687f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to create a link farm on disposable hosting, likely for SEO manipulation or to redirect users to malicious content. No scripts were extracted from this sample, but the presence of numerous external links suggests a phishing or redirection attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=advanced+development+economics+pdf PDF link annotation
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/00bb05e8d5cb7d44de4122a6204dcc0b/98182098049.pdfIn PDF document text
- https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/18i3i8u816hosq1iscasghaeq1/zevivowusojutudelirupinez.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9fmkm7s6dg08qcjnrcfq8m292j/5703558373.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087855f274e7---30807171529.pdfIn PDF document text
- http://soflacops.com/clients/83266/File/88677542600.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d405327311---6205588907.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68a00ddc20---2068737287.pdfIn PDF document text
- https://hoakhanh.vn/uploads/image/files/jifuzawepi.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/36aed2d294eaf6a8611520efbfeaa409/76919379256.pdfIn PDF document text
- http://filatelianumismaticaumbra.it/userfiles/file/bapovojogefegokone.pdfIn PDF document text
- http://swaminarayangm.org/userfiles/file/12543249670.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a604852f2e7ca3d6bf70649423989d07/bipudogatonoxoxonesa.pdfIn PDF document text
- http://wallawallahighschool1968.org/clients/75819/File/wuwikodovugivumotozogige.pdfIn PDF document text
- http://sinoscaform.com/upload/ckimg/files/202108260254245541.pdfIn PDF document text
- https://baobihungphu.com/media/ftp/file/fekakalekaxe.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/favivitabubiwolob.pdfIn PDF document text
- https://armagedonspedycja.pl/files/file/kixegofifujatuxusukake.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad13783fc3---xomofelawizuvex.pdfIn PDF document text
- https://aymfly.com/aym_image/files/41926508460.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5776f14066f8602e9381ee88ff2a49c1/zuzopasupaxazedubarafipav.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a727d0b8c1aea6932dc68aa37d2ba1fd/6625028464.pdfIn PDF document text
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/451872f1107cdb2d65405f2669f66b96/gugejasi.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c82039742---tizixitu.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16124e79fd21a9---14307327981.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_off0000ddd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDD4	17692 bytes
SHA-256: `a890aa6b2a80adfbf6ccab403c8df9abd0901e689b38ce5e833afbe21372b4b2`
`font_01_sfnt_off00010b3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B3D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012354.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12354	10728 bytes
SHA-256: `4b513b1678a633f477270ee407532f186c3fff313b2e447775afb1a9b7232461`

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