PDF malware analysis — malicious · 7849a80da8735aa8

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 14:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 791e131a8b078b43bb2da583c82d5878 SHA-1: 2be0d2353b234c957c7a2bdfe912bc7506d96d5a SHA-256: 7849a80da8735aa8d7def0b608060cca23a48de06aed1f9e0dbe3f9b2e891bdf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a distribution point for phishing or malware, leveraging the 'formcraft' plugin for file uploads.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://archism.ru/uplcv?utm_term=manually+manage+music+on+itunes PDF link annotation
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6578045c---rulujasinijobimemub.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609545d529fd2---sugoderigomunilezutizut.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c792664757d---57172776543.pdfIn PDF document text
- https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f7e0ede7fbf626ba8a80d6a7165bf333/guloberabeb.pdfIn PDF document text
- http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160723ef8c136d---tazozaz.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0095029a---gosixetevetewili.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b32570e530bd8ed33f46791d1fa317a9/wunok.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab58de824b---kexakumomomobizakuja.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99a577142---burilegope.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55ec222269---kasowupugokojegafewasor.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2aaeb434---6296030489.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bdc57306af64b1afaca03d4f336130fe/taruwafoxanewizivaw.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/23418287110.pdfIn PDF document text
- http://architettoletiziamasciotta.eu/userfiles/files/tulinofabus.pdfIn PDF document text
- http://alexhofford.com/temp/files/file/mojopabunotitaseti.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a89ff0edf8---kamisowubu.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/vazixugizuje.pdfIn PDF document text
- http://mebelhotel.ru/userfiles/files/pesusuxakitimex.pdfIn PDF document text
- http://cpspcb.com/uploads/files/75690633215.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1hhksqk9kfdv01tisig22dd823/fomukujusonowikaxovagaso.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1fiqfr6dpd036jv88jbinsgkht/37926735689.pdfIn PDF document text
- https://kuzeyilac.com/resimler/files/12933255725.pdfIn PDF document text
- https://alternativecarrepair.com/userfiles/file/danodudezatovus.pdfIn PDF document text
- http://innospectrum.eu/hirlevel/file/galalozudataruje.pdfIn PDF document text
- https://aartipalette.com/userfiles/file/29994824577.pdfIn PDF document text
- http://terralis.eu/catalogue_dynamique/file/31995956421.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e79f254db---suvibodapuxizozipokaniko.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_off0000f95d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF95D	10680 bytes
SHA-256: `9b0c5cd09a0d5c788eda57a2a79a7e77fc451291ecaf1e999801378b11cfbbbb`
`font_01_sfnt_off000111e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111E4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000129f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129F6	16900 bytes
SHA-256: `84024f84ece59d52745072982b6e6b2ac9686ad7614e7914ed77ebeef02aafef`

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