PDF malware analysis — malicious · 2cf73e2dbb8d50c5

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 08:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: cf124c5c29dde086a0cb92e65422b3ef SHA-1: 34f39520b534b272f50b1a4f728a96b0997b9970 SHA-256: 2cf73e2dbb8d50c53aa1fe4f2a0cae51f7dea3145071d9888cb29036352611bc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to phishing pages or download further malware. The PDF structure and embedded links suggest a spearphishing attachment as the likely initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd5ceb2a67---98630283672.pdf In PDF document text
- https://myphi.biz/nbloom/fckuploads/file/jezojuxotemegajo.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607f753639e55---nufovivekiduloxedafum.pdfIn PDF document text
- http://status-go.net/gfx/userfiles/files/19624074322.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5903cb5ed8---pebezufigemugajexaxu.pdfIn PDF document text
- http://m3hotels.com/userfiles/file/fafam.pdfIn PDF document text
- https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/s3vhir7kegvnr2bdicsinnkmqu/68421414098.pdfIn PDF document text
- http://mobilesamara.com/img/files/file/19007508586.pdfIn PDF document text
- https://triangle-electronics.com/assets/userfiles/file/27422502578.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e949be76---94875530509.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19bb5d788b---42964628515.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2d98a1f13b8434a33229a49de5ae99ec/betifuzuzimaxe.pdfIn PDF document text
- https://bacninhonline.com/webroot/img/files/mugulujamemapule.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160815bb889bac---12279767655.pdfIn PDF document text
- https://steklo-shik.ru/userfiles/file/dixejomiwomekobabewi.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2ea65cbb4---bexuga.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3719407771---34318226414.pdfIn PDF document text
- http://angelojrobles.com/admin_initial_test/userfiles/file/depajinasagoro.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d979910cec500c46afd9629f3bd2adc1/88713865200.pdfIn PDF document text
- https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607589ed208fd---jetumorix.pdfIn PDF document text
- http://guowangcable.com/d/files/kagisudobube.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/26a10c3fc6eaca259529d515a7d885f4/96970035128.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9e6c0e186---woxinititopojatadisedi.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160867650a80cc---94385284352.pdfIn PDF document text
- https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/no4kb8d4ctb9llo8jqdhr4ifa6/xajomiguw.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1d40e543aeab2ff52671e12c7c668124/7455355291.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=traits+meaning+in+malayalamPDF 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_off0000ef26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF26	10408 bytes
SHA-256: `8eb5cd5d4c8792676e5b7e0388dafc7ab594119a447b7c88947ee4218437e880`
`font_01_sfnt_off000106b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106B2	16164 bytes
SHA-256: `d695b3f35faaae4303b412235fcef51364235aaa167f35753b17830c6dfa4a94`
`font_02_sfnt_off0001306d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1306D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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