PDF malware analysis — malicious · c1659df559862a5a

MALICIOUS

PDF

80.4 KB Created: 2021-06-19 15:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25

MD5: fa6b25a40fd7affad4bb9d58dec0b60e SHA-1: a55921f078d1c26c83d63d38bea41f668b55fb55 SHA-256: c1659df559862a5a0c56ce50d9699542be11de4dfd316bcaf6426f26075fdda2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9224

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160862617cd617---58120046120.pdf In PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b9c9ee488a3a47612f889a98e02cbfd5/kovevizudirinojow.pdfIn PDF document text
- http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f8e29e4eb89d83410bf726c5d5987b5e/85704989353.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/08e37e6cc9b8df1ff8d1c377c5b620a6/36055671705.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/15124e124c254e1c38c76be89f4e332a/12203731106.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad28fca2b29---wifaxerolofiru.pdfIn PDF document text
- http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f9bcd7505---22547502526.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4aae47dee---68557898961.pdfIn PDF document text
- http://t-eamplus.de/web/editor/files/jubufugapege.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/63l2v3gql6lguqe0n8l7ab4ckb/6322442538.pdfIn PDF document text
- http://emeat.ru/var/files/1590527399.pdfIn PDF document text
- https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc9040d2d---pudilotoxofikigux.pdfIn PDF document text
- https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/283de144aaa0a0b91a7644d84acd7230/62653116536.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8f55c20a---23205924922.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jbr9jdue1p2sgq45icsg0bf806/23434641077.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qbrkoa69fgc7qb529j957gcqss/magaromutek.pdfIn PDF document text
- http://haai.org/upload/file/sogedo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=important+questions+class+12+chemistryPDF link annotation
- http://scripts.sil.org/OFLIn 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_off0000f37d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF37D	5524 bytes
SHA-256: `6964c24886d26f6ef3cd25f03b768b62a1639359c7a76fec62f075feb3e56633`
`font_01_sfnt_off00010629.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10629	11148 bytes
SHA-256: `9f7b8da38d824447e8b6df631ecb79688f97cb932e936ced82af640f2e3c74ae`
`font_02_sfnt_off00012c43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C43	16096 bytes
SHA-256: `9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61`

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