PDF malware analysis — malicious · 7b302877df19f208

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 13:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9a2e06b3ce5fdfbd665efdd93651521c SHA-1: d40460d5ac4ee7445d82858aa0f76c87569088c9 SHA-256: 7b302877df19f2082741eb7286f201d324dcc22f061b5a693105268bb024b4d8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://haisanquangninh.org/data/dulieu/files/8088087619.pdf In PDF document text
- http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109081157337993.pdfIn PDF document text
- http://www.hydro-tg.pro/upload/file/foliki.pdfIn PDF document text
- https://designclarf.it/file/25927124138.pdfIn PDF document text
- https://svenjakretschmer.com/ckfinder/userfiles/files/23469181141.pdfIn PDF document text
- https://btsmstlucia.com/atomicsteps/upload/userfiles/file/62539280643.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ade495f76---48831648143.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613668fe4c0e9---luresanek.pdfIn PDF document text
- https://digireg.at/upload/gaverunegenitadoxepa.pdfIn PDF document text
- https://termoformat.md/img/files/tuxogujivuja.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b2537879e08c415e299c4d49f60ee544/sirujagubowizowad.pdfIn PDF document text
- http://caramelitos.sk/files/44162309461.pdfIn PDF document text
- http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexesazixikepogaw.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ounhrshorubas46ie3mobgs7g0/40703932984.pdfIn PDF document text
- https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4m9hk427pgv4cv68bgu21k1dl3/piseperewonotatujavo.pdfIn PDF document text
- http://yavuzselimvakfi.org/resimler/site/files/64065619691.pdfIn PDF document text
- http://www.singchai.co.th/ckfinder/userfiles/files/11545490652.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef80e4bf0d---28316131019.pdfIn PDF document text
- https://lmcmanager.com/ckfinder/userfiles/files/volufuwofesuxesole.pdfIn PDF document text
- http://electrogalicia.com/electrogalicia/recursos/archivos/wunikiromapowofolojiz.pdfIn PDF document text
- http://max-metal.pl/gfx/file/53753806066.pdfIn PDF document text
- http://www.deep2001.com/images/library/File/xowusegimuxadonumujuwo.pdfIn PDF document text
- http://shippingengineering.com/files/ckeditorothers/97105305097.pdfIn PDF document text
- http://bushurov.ru/images/files/99015055955.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=eut+vpn+mod+apkPDF 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_off0000d93f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD93F	10256 bytes
SHA-256: `d22e79f41f4669956746f2931d32342625faab57aef4bb3b6215fe6d722b15af`
`font_01_sfnt_off0000f03d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF03D	18060 bytes
SHA-256: `4e7a896b8ce17c447b5ccabed6b00adc40a58070a8013bb9d03d6fd0abf967f8`
`font_02_sfnt_off00011fc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FC2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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