PDF malware analysis — malicious · 5cd4f293138d18a2

MALICIOUS

PDF

93.3 KB Created: 2021-06-26 12:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: caca79a02e87421ce0428fce184077a0 SHA-1: c05822c91fe78c0ae78e5b2517f8f140761176b8 SHA-256: 5cd4f293138d18a2367304d32dcb367a4202ed677df575e522cb2f26a7ea0fc2

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'password-protected archive lure' heuristic indicates the document is likely part of a multi-stage attack where the password is provided to bypass gateway security, and the ML classifier strongly flags this PDF as malicious. ClamAV also detected it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9866

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d87d5858a---35645567232.pdf In PDF document text
- http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ae6172c2---30264959705.pdfIn PDF document text
- http://stlnsk.ru/uploads/file/woguxazeriwonefanekegotaw.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e41ac189647a13c5c66ea6382f493ead/10560183532.pdfIn PDF document text
- http://applexin.com/ttpsea/files/file/49323814414.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/48d3da45887a101fdd88b4bcdd2232ee/71082870962.pdfIn PDF document text
- http://kimyasaldubeller.com/upload/ckfinder/files/tipugepejomed.pdfIn PDF document text
- http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084e59f5fe55---86142241193.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c0e0ab37138da92f99e66a689cb47cd1/62285655817.pdfIn PDF document text
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9646b3ea---61471567863.pdfIn PDF document text
- https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073365849d79---43224870071.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/q4kbgcvrphn0q6qarohceo7kci/tufaravogufopilowufa.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/53cd409381c7a8ffaf204bc9642ae67e/73063523984.pdfIn PDF document text
- http://davidhammerstein.org/userfiles/file/88237394578.pdfIn PDF document text
- http://kapli74.ru/upload_picture/35623048731.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901eb9c3249---nisogewig.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/uqe3cp4klt4i4tees2eij4sqgf/zegezuxazed.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160743b6794ded---69912149634.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607700ab2c509---66244664080.pdfIn PDF document text
- https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d637f6d57ca---47552424184.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca21600b8c---36508772685.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rgma65da4d0kc79qr06dta4hdb/83781297729.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/k86rpubf5b6q4c63cac66nu2b1/wonofefago.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=touhou+project+6+downloadPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e4dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4DC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fcee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCEE	17848 bytes
SHA-256: `43c6356078532163d894e2c72bd35efe7f9200d6ede55939a46d4fa3e951eaff`
`font_02_sfnt_off00012c0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C0B	16268 bytes
SHA-256: `b386d9056a900824ec2c762c9a86b28d0f37cc36a5ea339cdc2f9d7a1723a461`
`font_03_sfnt_off00014208.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14208	10800 bytes
SHA-256: `6ad3189549ca2a8d48271143e2ba6d706a20d3f1b29ed3285166de04197d8862`
`font_04_sfnt_off00015af8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15AF8	2856 bytes
SHA-256: `e44fd699dffb3fb9330e0b6ad90fa4ce37b51dd9811c26108e93856710b6f451`

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