PDF malware analysis — malicious · e826ce2455abe65e

MALICIOUS

PDF

83.0 KB Created: 2021-07-26 12:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 94a77c60d13598aa673cdaa535a783e8 SHA-1: 35eb0a85274b2dfc48d1afb6d534c9c0a5e7f06e SHA-256: e826ce2455abe65e568b6efd5762f8c545f1a44f2dd7ed59ba55ee2f031a099d

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://abimobiliare.pl/pliki/File/gubamofivosapir.pdf In PDF document text
- https://malashealthcare.com/userfiles/files/15208887599.pdfIn PDF document text
- http://lyzebrno.cz/userfiles/file/86963450242.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/gqeklta6q2hl9goooep7jo3a67/3275454555.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf36a568e8d---negosepilagejixim.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5da20e30c599d915bf368bff5dd582fd/zomunapokadapedexinubafi.pdfIn PDF document text
- https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/3hb0jrqbdcspodfig80jbu2vfg/58608036185.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479dbb5cba---9472865533.pdfIn PDF document text
- http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/26041011635.pdfIn PDF document text
- http://anatolianlgs.com/userfiles/file/10157158458.pdfIn PDF document text
- https://childconcern.in/trila/userfiles/file/10955964499.pdfIn PDF document text
- http://baggiez.net/userfiles/file/81471223314.pdfIn PDF document text
- http://rencontres-icare.org/userfiles/file/kozegat.pdfIn PDF document text
- https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/rafejumukapedisozojez.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b924d3181---xojef.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/5a491e06b1ed65a49eb24f9af9fc2f09/53874606619.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/5b6637afdbd869f32b16ea75a46c3a74/sidagemun.pdfIn PDF document text
- http://kleiberit.ru/files/file/lojilatowidavobukezo.pdfIn PDF document text
- https://ehotelgateway.com/bot/ckfinder/uf/files/97980288225.pdfIn PDF document text
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d12f9447841daca7dbd255b105fecf25/zezozalunigevijorisojiki.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fk2jcantos8d7adteuff89hotq/23928413505.pdfIn PDF document text
- http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80630d877---5483594799.pdfIn PDF document text
- https://anmimar.com/royal/userfiles/file/taluwaruzo.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723fe02146e---67738411943.pdfIn PDF document text
- https://ebooksweb.net/files/file/sapanak.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=calendario+2019+escolar+2020+mexico+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_off0000de40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE40	11276 bytes
SHA-256: `0920ea5288c07dee83b2b8447d6aa6da619567f59e339fa69965be08e31b6e9d`
`font_01_sfnt_off0000f8c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8C4	17184 bytes
SHA-256: `acadb51612c7e0fc46ce420f13bb0fe5178f6ffd6955966469909917bedcc3b2`
`font_02_sfnt_off0001245d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1245D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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