PDF malware analysis — malicious · 3b47908b1083d866

MALICIOUS

PDF

81.8 KB Created: 2021-07-21 10:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: a71295995750e5881de9d05267e58234 SHA-1: ed014e0f4e93f6e98b9e66b3944d530688cf4e46 SHA-256: 3b47908b1083d8661af28ae2231d59e466afc7950af4b11782f3434b59af0df1

132 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, indicating it's likely used for phishing or distributing further malware.

Machine Learning

Nyx PDF Classifier suspicious score 0.3778

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 http://cathugo.de/res/wysiwyg/file/satedobisoresilawaz.pdf In PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3779874a30---19526774289.pdfIn PDF document text
- http://pinzimoniofiumicino.eu/userfiles/files/96682872115.pdfIn PDF document text
- http://ahdongjiu.com/upload_fck/file/2021-6-29/20210629110624120297.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/1a0618cb7608ef2ca156fb1c3418f47a/65278166681.pdfIn PDF document text
- https://angkoronetour.com/userfiles/file/wamubejunevaliwamasug.pdfIn PDF document text
- http://dspec-car.com/js/upload/files/rokopajak.pdfIn PDF document text
- http://er-trans.com/img/produkty/files/gidowepibez.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/65f1333a0ef2e19caec5c635b2ce46cd/nepitugugawex.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df269a23596---kekobekulejaj.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-5-31/20210531015441336919.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4a7641bce7928035c4fb483150d94c98/65546577024.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/89ee1c6c1324c3dbdac8e16972503fa2/vipuj.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a202b1ba477---gutamedanajovixosijewo.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/59865248491.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd8ee0455---23774108929.pdfIn PDF document text
- http://ntep2008.com/UserFiles/File/vufosuduso.pdfIn PDF document text
- https://b2b-intelligence.it/uploads/file/gokunamemobavaxonugigoxo.pdfIn PDF document text
- http://surtek.biz/image/files/20150108_034444.pdfIn PDF document text
- https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/70sblnvvrekk14v324k4leic99/nirugubukumapaji.pdfIn PDF document text
- http://bigcool.net/webroot/img/files/41680698377.pdfIn PDF document text
- https://burkina-businessschool.com/business_school/uploads/file/lixixoderuvufume.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/57470273667.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kristan+higgins+good+luck+with+thatPDF link annotation
- 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_off0000f792.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF792	16976 bytes
SHA-256: `61f8f2ce7aa43d2f6fb0597f16d1459e1a356d283a2b14b86337e2f09bc24c78`
`font_01_sfnt_off00012423.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12423	10788 bytes
SHA-256: `874cdd7a8056c8ebf2491e978cc2bcae145c20a6a0c16b22edbe32401f301571`

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