PDF malware analysis — malicious · 6c79d9fbdf1dae41

MALICIOUS

PDF

70.2 KB Created: 2021-09-04 01:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 477b428742e553d07c5e1a8c3492a746 SHA-1: c438084324c081cee68213141ff6ebce689f1f89 SHA-256: 6c79d9fbdf1dae41daf68150aa5d63525ea76f3dc4895479f7e5254a2282df0a

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.8531

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.
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
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://pixomot.ru/uplcv?utm_term=hiroshima+john+hersey+book+pdf PDF link annotation
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9239b374---gozenasinuzorogo.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c056c14d1b8---tomenovogunosen.pdfIn PDF document text
- http://rolmech-strzelno.pl/Upload/file/vofekabumadepop.pdfIn PDF document text
- https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/53605c173bf9bf932ced5bb697b41678/55949407517.pdfIn PDF document text
- http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210602154006604343o73s6k.pdfIn PDF document text
- https://baoyi-chuck.com/ckfinder/userfiles/files/zitatovisazuvipur.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16079e67e7edc4---33997223749.pdfIn PDF document text
- https://areicon.com/images/file/setorugutilezejebim.pdfIn PDF document text
- https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a0ff246a---buzopamojegazojokosuwed.pdfIn PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c4e8c2c42---85779967033.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5fa1229b302e902044d6e7273d65f27a/totarubedorogelekolimami.pdfIn PDF document text
- https://arabadvertise.com/userfiles/files/fexet.pdfIn PDF document text
- http://bluebirdcanada.com/FileData/ckfinder/files/20210608_5A5BF564BBBD6BA2.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/016ef23d2bb6ff6f3082f647fe8e665c/21407985842.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4ca874b24bfd33e340a1a26115dd1924/sapagoxixupe.pdfIn PDF document text
- https://czus-lukasa.sk/userfiles/file/jemitafivifusek.pdfIn PDF document text
- http://a-b-i-s.net/layout/bilder/file/ginab.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16095904ecef57---xikarobaxekipo.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071ea398f844---jovuxejotarifenexupe.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5e721db8---bukotazivujevaxe.pdfIn PDF document text
- http://gloucesterclassof81.com/clients/23558/File/lawoselo.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e86c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE86C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010083.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10083	11084 bytes
SHA-256: `03e007937211c88b987fc080f18aa83891be4c9bc720fb8ffb15ef361bab8930`

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