PDF malware analysis — malicious · cd7267b69bc4108e

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 20:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 9f3d7ca06a481aeb87f3136d818069b3 SHA-1: 513c3404007849219258b72d17d5448665e67376 SHA-256: cd7267b69bc4108eec1a853c284ef46bca91d754e8559839f0bcade04d459b91

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://dalboncostruzioni.it/userfiles/files/nebumitutogepole.pdf In PDF document text
- https://chung-pei.com/userfiles/file/7522605777.pdfIn PDF document text
- http://jikaramen.com/uploads/files/falanibalut.pdfIn PDF document text
- https://comfort8889.com/upload/files/2808320740.pdfIn PDF document text
- http://mcutech.net/files/5590405244.pdfIn PDF document text
- http://umrllc.com/userfiles/files/xazipovasokoz.pdfIn PDF document text
- https://sieuviet.net/webroot/img/files/gugapuxuwanedubixoli.pdfIn PDF document text
- http://dzbnf.com/upload/file///21847060159.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5d1556ff---756474082.pdfIn PDF document text
- https://travelsafeway.com/userfiles/file/pujiwo.pdfIn PDF document text
- http://nlureunion.com/clients/33063/File/lupulefozinezaza.pdfIn PDF document text
- https://skinrepublic.vn/webroot/img/files/wuwularofopizi.pdfIn PDF document text
- http://bbfrontedelmare.com/userfiles/files/zibawelimibip.pdfIn PDF document text
- https://condicionamentofisico.com/arquivos/file/jijakazajelo.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/zabodaxex.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7be6261443877c8d7c08d4b0e14fb7c4/jizeb.pdfIn PDF document text
- http://pettwayfamilyreunion.com/clients/39389/File/61822487826.pdfIn PDF document text
- https://balaji-technology.com/userfiles/file/11541092167.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081b17265925---64884131034.pdfIn PDF document text
- http://ilturismoinitalia.it/userfiles/files/ruliziserikiw.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2131278381---kogasil.pdfIn PDF document text
- http://0965818789.com/CKEdit/upload/files/tufonudabaporozexasol.pdfIn PDF document text
- https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8009ae53afdee7c16b5e0e3f3fa4a3b1/wowadatukixob.pdfIn PDF document text
- http://aldara-latinoamerica.com/userfiles/file/38864493063.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f2017df0d4c75d6f73974d20e59dbd83/76421528101.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=why+does+my+iphone+not+open+pdf+filesPDF 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_off0000cb15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB15	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e32c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE32C	10608 bytes
SHA-256: `c7dfcd2495ce4d0793c2d4e286e89ef89f56f9869a436f6696226ffa8d278512`
`font_02_sfnt_off0000fb33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB33	16872 bytes
SHA-256: `731941db712ac5b7e1e6039db2da566c22cf029d2cf3e737b9ed97993201d51a`

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