PDF malware analysis — malicious · 3177187e6e9da193

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 08:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 31ede8027c5d4f631dbe5a0c1d5d970f SHA-1: cace3a06a256fde3b8fdbcf72623fd2e0ed6cce3 SHA-256: 3177187e6e9da193b4267cd254cfc0c0b172367b290dc4f7addaae82dd15b2d0

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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
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://kurtoglumob.com/upload/file/vubawumitoresufuf.pdf In PDF document text
- http://tuclubcr.com/campannas/file/wuwive.pdfIn PDF document text
- http://paglialonga.it/userfiles/files/xevafosopuwumerafa.pdfIn PDF document text
- https://snf.styleguides.ch/userfiles/files/72270612800.pdfIn PDF document text
- https://stka.gr/ckfinder/userfiles/files/xotasonuxofixepefexowu.pdfIn PDF document text
- https://bahceneryaman.net/public/content-images/files/88091507481.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff032c748b---labegijerupiwerusig.pdfIn PDF document text
- https://ski-valloire.com/ckfinder/userfiles/files/16169879471.pdfIn PDF document text
- http://chieusangducphat.com/uploads/userfiles/file/96002336140.pdfIn PDF document text
- http://rotang.net/userfiles/file/18307267946.pdfIn PDF document text
- https://thebookonpersonaltransformation.com/FCKeditor/file/jikilegiliri.pdfIn PDF document text
- https://itchanoi.vn/uploads/news_file/65535085099.pdfIn PDF document text
- https://cafeau1ait.xyz/js/ckfinder/userfiles/files/88639284252.pdfIn PDF document text
- https://littleitalypizzany.com/nbloom/fckuploads/file/jutetisajuvifa.pdfIn PDF document text
- http://mudrkanuch.sk/editor_uploads/system/files/40648794546.pdfIn PDF document text
- https://mtydizayn.com/userfiles/file/pijunoluf.pdfIn PDF document text
- http://ttlh.vn/storage/ckfinder/files/sivuvutubunivopaz.pdfIn PDF document text
- https://windfreeklima.com/upload/ckfinder/files/62374325138.pdfIn PDF document text
- https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/928604366.pdfIn PDF document text
- https://www.seblocation.com/ckfinder/userfiles/files/dowuxixemax.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13b8cf09c---kafotanewepixugutes.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf028e343---2106946373.pdfIn PDF document text
- http://www.oomedia.com.tw/ckfinder/userfiles/files/5624133049.pdfIn PDF document text
- https://llibreriaha.com/img/events/file/fututevipiwegibedabisoma.pdfIn PDF document text
- http://ever0036.com/assets/uploads/ckedit/files/20210909075243.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=game+earning+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_off0000eac4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAC4	17452 bytes
SHA-256: `ba2976d49f125fb85f727d973584db0e2803d14267a0e9c37e9a49a384acba68`
`font_01_sfnt_off000117c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117C5	10296 bytes
SHA-256: `6b62125e8c7229ee1cfd480ea61f9631a0589c90c7a2b079df8f66be88e85934`
`font_02_sfnt_off00012ee1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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