PDF malware analysis — malicious · 8f57cfc6d23ac777

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 03:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04

MD5: 4b579ba7f7fa5743a07916dc5abe9ad8 SHA-1: 6e54baf6a79f054571fe035802c83e4d105dadce SHA-256: 8f57cfc6d23ac7773d0b322d6d69ba0c5bcbbb3d782ee7ec655dc60afe98766e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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 0.9912

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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611e54fc0a083---sogagagodebijonuvoguroku.pdf In PDF document text
- http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/raserufepijox.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d413a3f4d---gukofavepepomulelotemo.pdfIn PDF document text
- https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/12325448800.pdfIn PDF document text
- http://setadijital.com/img/userfiles/files/82184883642.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4dc2aadd---6575933800.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d054b190---20162628624.pdfIn PDF document text
- https://ntiverification.com/userfiles/file/97091150367.pdfIn PDF document text
- http://vstarmp.cn/upload/files/20210624_040545.pdfIn PDF document text
- https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/nklia8usv3e9bmhfgo6d1f5r3g/pezusalebuwibigasubaf.pdfIn PDF document text
- http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/81493290943.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160add4ad476f8---4607253173.pdfIn PDF document text
- http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/79213073270.pdfIn PDF document text
- http://haumeaonline.com/userfiles/file/dewovazarexanavudev.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c59b401b4---18861281650.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/553b7665a6320113898a6fd7df455d25/92131835688.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8c5d862025c99da520bbd231a2b4188c/pejesuduvamupinera.pdfIn PDF document text
- http://ahxxzx.com/userfiles/202106/file/19852930474.pdfIn PDF document text
- http://oiseau-bleu-morzine.com/userfiles/file/2079971191.pdfIn PDF document text
- http://noahsmarinesurveyors.ca/userfiles/file/88343381969.pdfIn PDF document text
- http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba393ab4f7f---jozaretej.pdfIn PDF document text
- http://fincasotilloviejo.es/files/sotillo/_repo/file/5257038083.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/247248a968e0f9a4588662578118b0c5/pajubisitakeduzov.pdfIn PDF document text
- https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086b65a01dfc---8266745466.pdfIn PDF document text
- https://markiza-trade.ru/admin/ckfinder/userfiles/files/94562106456.pdfIn PDF document text
- http://stattus.com/assets/file/tomufo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ate%C5%9F+ve+su+3+kitap+pdf+indirPDF 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_off0000e88d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE88D	18620 bytes
SHA-256: `3aa1e0de16bac6d365e535708ed2b27ed7574539a3ed6d503b7f570862166ab8`
`font_01_sfnt_off000115dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115DD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012df4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DF4	10980 bytes
SHA-256: `a9d7a046c3739591ecf1a8b810a8eb23edcca2b47a938f106ca241ccd639033a`

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