PDF malware analysis — malicious · b95efed7fb8905c4

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 06:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: b61f4f2c094ab6be03c418449b7a2f1e SHA-1: e84b88183f929d7da7836f1c45be6538b7bbf18d SHA-256: b95efed7fb8905c4c269849f62dd2e83b330b3ad5bdaeb9e445a9b6c690d9996

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 5

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://billionbosses.com/ckfinder/userfiles/files/50633667056.pdf In PDF document text
- https://www.ventisilva.com.br/ckfinder/userfiles/files/ramefafojugezelewi.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7205f28a3---lonoxim.pdfIn PDF document text
- https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/43086005783.pdfIn PDF document text
- http://etkenkalip.com/files/54504961206.pdfIn PDF document text
- http://renknh.com/ckupload/files/38961425191.pdfIn PDF document text
- http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614216cb93a45---77753490520.pdfIn PDF document text
- https://implant-drill.com/userfiles/file/gafofapelel.pdfIn PDF document text
- http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/42662487891.pdfIn PDF document text
- https://luathoanghuy.com/uploads/files/40088691939.pdfIn PDF document text
- https://rachelrom.com/rescontent/file/jorobexe.pdfIn PDF document text
- http://www.evisiontiendaonline.com/ckfinder/userfiles/files/80615672654.pdfIn PDF document text
- https://noursportevents.com/wheelmarine/userfiles/file/dipijotagusofejigizu.pdfIn PDF document text
- https://callmarkinvestments.fortunekenya.com/callmark/files/tebuvupadufutu.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161424e943cb3a---molosixobufuxuxuvaxivo.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0ck84ua2t46vf1bfk3m3dbrta0/64590467584.pdfIn PDF document text
- http://sgpeo.pl/users/file/84893875257.pdfIn PDF document text
- http://baschin-heizung.com/meineBilderAlbertGrundschule/file/dikexofopilewalev.pdfIn PDF document text
- https://mailing.crpm.ch/ck/ckfinder/userfiles/files/69115113269.pdfIn PDF document text
- https://dimensioninteractive.com/WYSIWYGImage/file/javupujumevi.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132629106572---minifapomipewefibojoboke.pdfIn PDF document text
- https://www.padanguparduotuve.lt/ckfinder/userfiles/files/futafibofaxatigezimefe.pdfIn PDF document text
- http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/pexuxifada.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/572cfa708974f4870a7af0874cc5ec90/88232362928.pdfIn PDF document text
- http://racecross.com/upload/edito_fckeditor/file/wawoxibobejizo.pdfIn PDF document text
- http://31kouqiang.com/userfiles/file/1630804090.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=top+5+android+games+in+indiaPDF link annotation
- 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_off0000f3a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A8	17024 bytes
SHA-256: `a5f03735a1c38bf0c418d3040c348f622829239ca7f9e2b694a9d9720b0d7e79`
`font_01_sfnt_off00011f78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F78	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001378f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1378F	10688 bytes
SHA-256: `b3a015cb5c492413af73c106f3641a6ea51d6d686e1c015b9a2d1cf33d2ce060`

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