PDF malware analysis — malicious · 7a184a7c98cd17e3

MALICIOUS

PDF

78.1 KB Created: 2021-08-09 02:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 5c5ae633a4b9d123cd23d1c3077306d1 SHA-1: ab795f2e0b709d99d3934233dc9c811f4873ad1b SHA-256: 7a184a7c98cd17e31f5b9a02167e2fc10d678e04a9f6d5ac9a72c24b5377dfdd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9941

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://crysiq.ru/uplcv?utm_term=o+m%C3%A9todo+billings+livro+pdf PDF link annotation
- http://reversetheclocknow.com/ckfinder/userfiles/files/gonetemanerimakawef.pdfIn PDF document text
- https://juraganmonyet.com/contents//files/76496036082.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3571bdf39b927d802c387521b923f3ec/30868418437.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc516b95f5---xitunezax.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984736a7b9f---jitomureluvofunekejumatu.pdfIn PDF document text
- http://baschin-heizung.com/meineBilderAlbertGrundschule/file/niripetesese.pdfIn PDF document text
- http://longarmquiltacademy.com/fckeditor/userfiles/file/3083390338.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/855b9466e5fee770064c991a2fe8eb5d/58223951681.pdfIn PDF document text
- http://alarcon-v.com/editor_upload_image/file/45647329185.pdfIn PDF document text
- https://ichibaninfotech.com/ckfinder/userfiles/files/suwosu.pdfIn PDF document text
- http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b86e20698f---81817079398.pdfIn PDF document text
- https://acgroupenterprise.com/userfiles/file/23058911810.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/d4qv4dva3qo2lekb92tsi05ods/vupiwiv.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/5329033582.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ff60a2b7996fd4ac2ce0a58997b88b7/farometo.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/hpt9lriafne61blakqr6qc014c/28962446636.pdfIn PDF document text
- http://extracam.es/app/webroot/arxius/file/36156261830.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2ea7fe2354d73844fdb9a33bfe275101/65986703476.pdfIn PDF document text
- http://halmar.info/userfiles/file/95933816471.pdfIn PDF document text
- https://cornwallstaffagency.com/userfiles/file/tusij.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/badf2e74df7d16113eb0e7ce0365e499/54352939081.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18c7a55d36---48558452740.pdfIn PDF document text
- https://zivotzaokny.eu/res/file/36428870201.pdfIn PDF document text
- http://davidlbrooks.com/clients/868292/File/46129944870.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/u41gs75vjf53dsg9iuit8s6ve7/semabexo.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0d10f884---11519376420.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_off0000c8bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8BF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e0d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0D6	10932 bytes
SHA-256: `5ffb0f283309585cf32a564583e412ace37d0e38b9d0d34f9b38693c5f55134f`
`font_02_sfnt_off0000f9b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9B2	18700 bytes
SHA-256: `c4fe6dbb6c3c51e08337633d2b6123c486cb27ae7da6f306ff34537bba34d7f4`

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