PDF malware analysis — malicious · 9e56524f69f0daac

MALICIOUS

PDF

80.5 KB Created: 2021-07-17 16:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: a87ad3fb8d721408016e4c681d1e6645 SHA-1: 3f567c589131f6d50025423f1fdd404ddc7821dd SHA-256: 9e56524f69f0daac040fd2d83a1146287c76541ef4b06e5bf3fa3a26f9deeed8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://esperanzadeavila.com/fotos/file/36843386814.pdf In PDF document text
- https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/74nbksltkqdlmcjuhpurj4k01u/59951612526.pdfIn PDF document text
- http://ehomeforeclosure.org/images/file/vevimunopi.pdfIn PDF document text
- http://arredamenticucinesiciliane.it/userfiles/files/85541521488.pdfIn PDF document text
- http://koreaseals.com/ckfinder/userfiles/files/3292660222.pdfIn PDF document text
- https://shriayurvednagpur.org/public/ckfinder/userfiles/files/39871208526.pdfIn PDF document text
- https://sieuviet.net/webroot/img/files/bogomosifer.pdfIn PDF document text
- http://serramentisiciliano.it/userfiles/files/50236316146.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cdbf59f6bbb31e3e00458c0c0131eb01/88671869872.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160760d4b1ba0a---fagovitezaje.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e9cbf07598d7e2fb82fa66c4f9baeda0/zijodilata.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c51141a860d---safukirevolanari.pdfIn PDF document text
- http://geometrabottero.it/userfiles/files/jumowi.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adf13ec5b64---desanojivefogedu.pdfIn PDF document text
- http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/wevubitapaforivobula.pdfIn PDF document text
- http://goteneplast.se/files/images/file/rurofizumupiranevi.pdfIn PDF document text
- https://alianzatours.com/imagenes/file/mituredij.pdfIn PDF document text
- http://box8websites.com/ckfinder/userfiles/files/gipiposewow.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lud55imcddph314tq9p5oftvmd/rabukujeladabitezufased.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089eab59126e---96039074460.pdfIn PDF document text
- https://sunarchegypt.com/userfiles/file/xuzilovegipowakefuvukenu.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad5dc4c33---76714230292.pdfIn PDF document text
- http://minhvuongthuphap.com/upload/ck/files/97008119453.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9757a7205a---86432693483.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f6c629ea---fovozifisuwubez.pdfIn PDF document text
- http://duoctruongxuan.vn/userfiles/image/file/tojiwusidis.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848bb9049da---vaweneleziwojanesokokure.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=vocabulary+workshop+level+a+unit+13+synonymsPDF 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_off0000d852.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD852	15964 bytes
SHA-256: `2ae101775ed8725db960373b41347b86056778b94fae8c11e0b662692eb848bd`
`font_01_sfnt_off00010175.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10175	11432 bytes
SHA-256: `57e1566c9d1889b90eca2de36599868ab6123866971279f1f84a513009fda667`
`font_02_sfnt_off00011c39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C39	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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