PDF malware analysis — malicious · b98311b06615e5bd

MALICIOUS

PDF

123.1 KB Created: 2021-07-01 15:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: abddc59edebfec27dbca1b60725cce8c SHA-1: 81aa0c0ff90624a7438f77bb2d29bcd1689437f2 SHA-256: b98311b06615e5bde7fbb73bbfcc2fe50ea3be9d5d098d059e14a995a203e2e5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9838

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 https://infrive.ru/uplcv?utm_term=introduction+to+electrodynamics+griffiths+3rd+edition+solutions PDF link annotation
- https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/52glpdfm5lqtdkl940kij8kjo3/dazigamejajasomobul.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff1b8e9859---xipagiwafaberenafogepo.pdfIn PDF document text
- http://xlsferrosilicon.com/d/files/50724781200.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b9d9eb9d3---98782275744.pdfIn PDF document text
- https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073195710238---wudorekatabigomemovi.pdfIn PDF document text
- https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4e2ee8e1f7dcccf2af7fa82e43f47209/mowes.pdfIn PDF document text
- http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57501312596.pdfIn PDF document text
- https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c681d7a44074d5cba484c7f0e3a32397/zolelorivusu.pdfIn PDF document text
- http://dongshengcable.com/images/upload/File/77832148097.pdfIn PDF document text
- https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/d1b5d15d9c0d01e97346dd3921ebac57/92198045323.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cebfd6d295c07fb2ee541e777608bd5d/79037446017.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9beba4a3dc---lolon.pdfIn PDF document text
- http://newgatedesign.com/Images_upload/files/64684172622.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900fac8256f---26457564512.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/20219b8a453ad4ebb5e72981c79d2baf/mowajonuzoxiwuwom.pdfIn PDF document text
- https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b90488b2be7384437b40db03a98197c/kafalijonudaketuso.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071893a32f47---72803602024.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/44db877e4f7d3422733a4949480f4beb/49037267812.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/nusefu.pdfIn PDF document text
- http://grandrosso.com/js/upload/files/70442257396.pdfIn PDF document text
- http://emailreceptionist.net/userfiles/file/tazirakujejunalimaza.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bivbim21pbcal09oa9bh2c65ol/30655195463.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd5acbfe8---29086237304.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c02184f0c5---porilume.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a470952a35---milakerokadaxazu.pdfIn PDF document text
- http://mahnomenalumni.com/clients/879209/File/95174940856.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_off00016e70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16E70	22636 bytes
SHA-256: `08180cec1974fd233cea9eca0f6652dfa479e50bb6c62479fcb69bff2b562e49`
`font_01_sfnt_off0001ac4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1AC4D	11260 bytes
SHA-256: `ff2d6312d943881b8d100ff6efaf943634c36604e311b3bc9e541c53811ac8ef`
`font_02_sfnt_off0001c667.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C667	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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