PDF malware analysis — malicious · 9aef9a68b0d41201

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 02:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 77701cd3bd900eaef2066b1b33121074 SHA-1: 13e475dba5287e254a796858cfc2b11759fa8fe3 SHA-256: 9aef9a68b0d412011b9fbbf2faf3713ad6f4e4510e5ed35fa178df033cf147fb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9901

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://sunkamalzemecilik.com/userfiles/file/gijubo.pdf In PDF document text
- http://xn--q20b13r9leepaeb.net/upload/file/202109052216323242.pdfIn PDF document text
- https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/puvonomakozagupafonos.pdfIn PDF document text
- http://makinsushi.com/uploads/files/46433461784.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/14285059de03902fc690532883dfdb64/81934811934.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb66ab1a57---47265031840.pdfIn PDF document text
- https://ausztriasi.spawellness.hu/upload/hirlevel/files/80254861620.pdfIn PDF document text
- https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f857d94e6---207239166.pdfIn PDF document text
- https://lodoshosting.com/calisma2/files/uploads/62816228912.pdfIn PDF document text
- https://saunadlaciebie.pl/userfiles/file/jidekojaw.pdfIn PDF document text
- http://facilitymanagementassociates.com/survey/userfiles/files/35263092503.pdfIn PDF document text
- http://abwcrainhwy.com/uploads/files/16477271239.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613475bd8d910---96091568500.pdfIn PDF document text
- http://szao-spb.ru/images/news/file/dedakugavudebevozekuzogux.pdfIn PDF document text
- https://aquaprosmart.com/userfiles/files/widemasodedefe.pdfIn PDF document text
- http://inciboya.com/resimler/site/files/lajipiwaxonod.pdfIn PDF document text
- http://bpsstudio.hu/uploads/19364398948.pdfIn PDF document text
- https://doublehair.center/upload/ckfinder/files/jawojewevoxamefidok.pdfIn PDF document text
- http://dongshengcable.com/images/upload/File/nowol.pdfIn PDF document text
- http://rentator.com/uploades/fckeditorfile/96242730066.pdfIn PDF document text
- http://kehlux.lu/userfiles/files/xawelesezanujubupuku.pdfIn PDF document text
- https://firsatoyun.com/calisma2/files/uploads/91288548155.pdfIn PDF document text
- https://everestart.com/images/stories/file/93901648736.pdfIn PDF document text
- https://relans-nn.ru/images/docs/file/bosoniluziditilobi.pdfIn PDF document text
- https://exam11.menapoint.com/app/webroot/upload/files/73477265068.pdfIn PDF document text
- http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75703083065.pdfIn PDF document text
- https://planningpvedh.nl/ckfinder/userfiles/files/98961336037.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=storage+space+running+out+android+how+to+fixPDF 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_off0000cb82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB82	16856 bytes
SHA-256: `3e9df0838a74a3b129c75ff5fc8585c11ffbe7f119836a7923819a2048da7a2c`
`font_01_sfnt_off0000f6c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6C8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010edf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EDF	11216 bytes
SHA-256: `d038c8058e029becbd268b38ee5db0060ed0bcebc35c3767aece47c5f23c2fd7`

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