PDF malware analysis — malicious · 3bf2d56162a90a73

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 22:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: cec7400a3ac83388e1db7d5c384c0f2a SHA-1: 3b2256f9054e95957b07ac16ba4583b00c4c98df SHA-256: 3bf2d56162a90a733eacc35a28aae82edb92e704857548dc2cbefffa87c0000b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of numerous external URIs and link farms indicates an attempt to distribute phishing content or malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=i+love+you+mummy+dj+song+download PDF link annotation
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/b4584c460d5e49e7574ed85df5419cdc/14882691887.pdfIn PDF document text
- https://istocdukkan.com/userfiles/files/61986090141.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc63d6a337---mepam.pdfIn PDF document text
- http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814f681ccd0---91517651345.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c8fe85b95---xuseduduzejebodamagosiw.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/nkmnqlloiult6ll09s86l1mte1/raximavudedivigi.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c94e186c---nekokuzedaropavo.pdfIn PDF document text
- http://hurtowniagrafit.pl/userfiles/file/lozetupusuwojadizipuwi.pdfIn PDF document text
- http://4reality.cz/userfiles/files/fojupu.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f591b98e3---16287501264.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b052861a0c3---kidejarum.pdfIn PDF document text
- http://yachtandgulet.com/userfiles/file/60873875409.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/25fa8lm7os5213l3514fc6duoa/37538633969.pdfIn PDF document text
- http://learnersdigest.org/userfiles/file/27065699610.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uqtr8f14h1a8vuba7on2nbi7i2/46139718595.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7a4b19ae---lulijeliburelunive.pdfIn PDF document text
- http://artospace.com/pics/file/tabovusekofulenugasilisom.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4785feed70b9ddbf7037e0eae7c74c48/zugijonelapixiwulekek.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1ar4u35djhp2slu77ap1r22fhi/wipanusifixowugokeju.pdfIn PDF document text
- http://mahlkoenig.nl/app/webroot/files/userfiles/files/zikupumola.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_off0000ee91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE91	17776 bytes
SHA-256: `ce2fe6bd0ec7d5b968bd9314cd85925c3006ed5d1dacca6f277faf77f9054024`
`font_01_sfnt_off00011cea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CEA	10748 bytes
SHA-256: `ce0c853981f0c4b915d2d58048557c2cd30333e2d6607597defa3fca06def180`
`font_02_sfnt_off0001357f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1357F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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