PDF malware analysis — malicious · f46e34a3b2691c03

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 21:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 94271608e1e20d722529f640540fd5db SHA-1: da000a16b1cc078a60be2f55d526a262df505a5c SHA-256: f46e34a3b2691c0305ad13df6570d6fc523801d45dd3bcc749a146e8ee5a31c6

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f71e360891---resogotumiwajosuvetajo.pdf In PDF document text
- https://coil.hk/upload/files/pebuzudubido.pdfIn PDF document text
- https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/kozerok.pdfIn PDF document text
- http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/nogumus.pdfIn PDF document text
- http://odesignlab.ru/admin/ckfinder/userfiles/files/kugujirinepi.pdfIn PDF document text
- https://lockerova.eu/admin/upload/documents/52310037770.pdfIn PDF document text
- http://oralrem.kz/ckfinder/userfiles/files/33077318638.pdfIn PDF document text
- http://graficaeformazione.it/userfiles/file/53371496937.pdfIn PDF document text
- http://pate4me.com/userfiles/file/kinufusokujozoto.pdfIn PDF document text
- https://burkina-businessschool.com/business_school/uploads/file/35851988377.pdfIn PDF document text
- http://www.gieskestukadoors.nl/ckfinder/files/files/7716679611.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d53f425257---96214419029.pdfIn PDF document text
- https://prolocolidodisavio.org/ckfinder/userfiles/files/sojamur.pdfIn PDF document text
- http://aweibel.com/Photo/file/felexufotowetopesujodi.pdfIn PDF document text
- https://2b3la571ga-70p.com/contents/files/27227568566.pdfIn PDF document text
- http://studiophotosfashion.it/userfiles/files/garesoboraxetefidij.pdfIn PDF document text
- https://shatalarab-llc.net/userfiles/files/37336010183.pdfIn PDF document text
- https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/jixojobolip.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7mn5g5tmov3tnqukd2opme4qd/28763531126.pdfIn PDF document text
- https://bulgariapools.com/contents/files/59042243952.pdfIn PDF document text
- http://caerulumpharma.com/upload/files/31200326018.pdfIn PDF document text
- https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/roxaguwinuba.pdfIn PDF document text
- http://kimbuunguyen.com/uploads/userfiles/file/81918317020.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=online+among+us+unblockedPDF 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_off0000b08a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB08A	10872 bytes
SHA-256: `f97cc6bb59405bab390b59c596026f67dcb5a24c83158218772b011ac1a8f110`
`font_01_sfnt_off0000c96e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC96E	16488 bytes
SHA-256: `6949427c3e5a34bb04c32bba83b76b399cc05eb509006b2a0e328b461ad88649`
`font_02_sfnt_off0000f3d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3D9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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