PDF malware analysis — malicious · e965f9693c45cef0

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 01:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d788f5619e1e881cec3718307b235daf SHA-1: 767347dece51815ece8386643de18d019de7edda SHA-256: e965f9693c45cef0eb4d0ecff9766bb0c44f90453cace0483d6fa4c626422f0e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to other PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links to potentially malicious content is sufficient evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 http://banhangcongnghe.com/upload/FCK/file/nedulejamemi.pdf In PDF document text
- http://islandpointfl.com/userimages/14355058265.pdfIn PDF document text
- http://beloezoloto.ru/userfiles/file/14743853218.pdfIn PDF document text
- http://epmachine.ru/d/files/2262055050.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bc61efe2a017ea65d0a63a09bd5b3740/dogivuzovadefeseregipeded.pdfIn PDF document text
- https://atasuorganiktarim.com/upload/ckfinder/files/44273695332.pdfIn PDF document text
- http://ahxxzx.com/userfiles/202108/file/kakopifavexo.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/391de7f8418a43f7561c984b6c3e7de4/29775229933.pdfIn PDF document text
- http://norilskgu.ru/userfiles/file/xipizomiponowupajaxotar.pdfIn PDF document text
- http://amandatravel.com/userfiles/file/japaroratovapesoxep.pdfIn PDF document text
- http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86469072371.pdfIn PDF document text
- https://itexpertdog.com/upload/files/vodajo.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/a5m1l8c0rpjkj1mjfrecojh6f7/xiwiluvad.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3d6e584e1d13a986b2efbe9a595909b4/65909209540.pdfIn PDF document text
- http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/11798399076.pdfIn PDF document text
- https://anthonygillant.com/userfiles/file/fajinewitogomipapaz.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c1d6e7d3887a8a20763d95bfe19008c2/zukinufasumi.pdfIn PDF document text
- http://asavn.vn/uploads/userfiles/files/zikijijedenej.pdfIn PDF document text
- http://the-bom.kr/upfile/files/82529144777.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc9f1b07e---xuputukituk.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1246e2189---70080948428.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/553669dcbd3569784d6d0e64a26f9aa2/losewirivimuwolutegi.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/ginapovulof.pdfIn PDF document text
- http://thayloilocnuoctaihanoi.net/upload/files/40982232910.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/92a4844ddb7fa933086d9d09fa91829f/rizazuzugemema.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb56969f10---lizovor.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=manual+strangulation+injuriesPDF 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_off0000f0bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0BB	10504 bytes
SHA-256: `a706e0168a5290084a9ec984fb7c71157f694f9c3f5972652db0382ed3fb17d5`
`font_01_sfnt_off000108ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108BA	17584 bytes
SHA-256: `91a1f6b6193cd85c71d0c8a5e29d7ad904f3cdbff44e271031b9f1a6935e9cac`
`font_02_sfnt_off000135cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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