PDF malware analysis — malicious · ded95bd28fc50f44

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 01:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: dcf6daaef6d5e38757c83f9dab8a2d2e SHA-1: 53d4a38ddf5bad21e8849adff6f1e25471e9f006 SHA-256: ded95bd28fc50f44192d314ac8ee56131b31b8b4526e9f26adf145478e3f1159

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains. This pattern is commonly used for phishing or to distribute further malware payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://queure.ru/uplcv?utm_term=bloodborne+how+to+get+to+the+dlc PDF link annotation
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419dfb4ac7---93859780608.pdfIn PDF document text
- http://amirafouad.com/uploaded_files/file/sosevegoxeretodib.pdfIn PDF document text
- https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9eb965f92e9208f54bcdc9b9e4354c81/1626413869.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/789f99d4b52aefb46b6e3b78c3e139b6/13755075461.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6d12bc1d23972c63e995eed13d03be84/dugimesenumofasewomilujos.pdfIn PDF document text
- http://biotop-zamosc.pl/userfiles/file/4126162374.pdfIn PDF document text
- http://pechati-piter.ru/userfiles/file/kukibutirodesirereli.pdfIn PDF document text
- http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799fa5e7ce1---51293375123.pdfIn PDF document text
- http://webinaris.net/ckfinder/userfiles/publics/files/13600096289.pdfIn PDF document text
- https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/t4ubkq3j813huq3bku4p52k9qt/diwutupupewa.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3fa2578016388593a2407e43d8e585f0/mavedobisizusis.pdfIn PDF document text
- https://sheenabusesandcoaches.com/userfiles/file/xojaluwofubijimoboge.pdfIn PDF document text
- https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kmv59ri1au63ht25loodrlqrb4/pubufumigajabob.pdfIn PDF document text
- http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa092ba0d4---lafagofuweloletigedozom.pdfIn PDF document text
- http://3e-machinery.ru/app/webroot/filesfiles/ziruzaradokomikakobixoj.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d015d7cd82---besirijegame.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094958c9dbf1---lufiborufozizadolulo.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cd3b83820da431f9b2a2a9b84133c5f6/10856488749.pdfIn PDF document text
- http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/99656558828.pdfIn PDF document text
- http://controldellaves.com/app/webroot/arxius/file/22490579258.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986cff171b2---72520600332.pdfIn PDF document text
- https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/379c1bcb32dfc2e5eef14663e5842452/2715068421.pdfIn PDF document text
- http://goddesshair.net/upload/users/files/59005330934.pdfIn PDF document text
- http://ck-tct.ru/userfiles/file/lorujemedodijopeb.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937317b53f---lalibedo.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e966.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE966	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010173.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10173	1696 bytes
SHA-256: `28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae`
`font_02_sfnt_off00010984.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10984	10504 bytes
SHA-256: `d056da42b0667d14521fbde9aeb1acc70c39f2c53d6a3aa5948b83cc24fe740b`
`font_03_sfnt_off00012131.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12131	18016 bytes
SHA-256: `51805c057252628196a7904415c90cc451fbb03741967490f3a6d6667997a881`

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