PDF malware analysis — malicious · 043ba647df0fd486

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 00:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3c11f740afc964e2140172ffe1b48944 SHA-1: f95c9b813350611471f4d9568550cb0ef6da8080 SHA-256: 043ba647df0fd486f1eb686a0c3fa58635925168865c3894aaf6c6d759b3dfc2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/edbc88c4752aa1d00a2ad818880d5109/83365109460.pdf In PDF document text
- https://nenmongdangquang.com/upload/files/94148217226.pdfIn PDF document text
- https://dabanbep.tanglehadong.com/upload/files/joxaropobalevozekibita.pdfIn PDF document text
- https://bientannamhuy.com/wp-content/uploads/files/muvuretudusi.pdfIn PDF document text
- http://avvocato-callegaro.it/public/file/20681530703.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161378f192fe45---dufewaw.pdfIn PDF document text
- http://hzdsbg.com/uploadfile/1631912430.pdfIn PDF document text
- http://werkschoenenverkoop.nl/images/docman/files/34254649475.pdfIn PDF document text
- http://conelser.hu/fck_uploads/file/debev.pdfIn PDF document text
- http://gewoongroen.eu/app/webroot/files/userfiles/files/96422384930.pdfIn PDF document text
- http://wo-kop.pl/userfiles/file/18099587516.pdfIn PDF document text
- http://teleserviciomalaga.com/ckfinder/userfiles/files/26536574224.pdfIn PDF document text
- http://ewtch.com/upload/files/mufiwutaroxa.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161430b1e13b94---20550617700.pdfIn PDF document text
- http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137adcfd77dd---zikogulunivufinamiwuforu.pdfIn PDF document text
- http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/norodibezobipipafajuwa.pdfIn PDF document text
- http://jongauger.com/userfiles/file/24428723474.pdfIn PDF document text
- https://channeloflove.com/ckfinder/userfiles/files/36145118006.pdfIn PDF document text
- http://nhadeptannguyen.com/uploads/files/76120370773.pdfIn PDF document text
- https://pensiuneavalentina.ro/app/webroot/file/64575153217.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145076133321---3529122772.pdfIn PDF document text
- http://evolutionchonburi.com/userfiles/files/tosuwogurabarulafoxag.pdfIn PDF document text
- https://e-uchebnici.com/img/file/22416170514.pdfIn PDF document text
- http://www.almansori-ye.com/almansorifiles/files/36551050071.pdfIn PDF document text
- https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/76735039167.pdfIn PDF document text
- http://ckm-machinery.com/userfiles/files/44556771499.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fingerprint+lock+screen+original+apk+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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dbc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBC0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f3d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3D2	17784 bytes
SHA-256: `5bce749a4effd84b169464705768b3c8a5875a0496282a049de0945970208ba0`
`font_02_sfnt_off000121f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121F9	10844 bytes
SHA-256: `b0401414d3c883454b4749bc4d231228141a49de4fa2151118515615009e4a41`

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