PDF malware analysis — malicious · 65a02908423c45b0

MALICIOUS

PDF

96.5 KB Created: 2021-07-04 17:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 1b23d2dfcbe2fcae912bfcf8c8a0f2e1 SHA-1: 64a5fe378e3c3048edc78b46e5c6fa35f855e51e SHA-256: 65a02908423c45b05fb652acfdcff9c830fc76acaa2d63b70ba7587d03d75128

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 ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content, aligning with the characteristics of a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9806

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/f7tpjhgg9epb198mplhnl5ojup/vonufutonevu.pdf In PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c774ab5deaf04a6b33d011ae768f8246/jujexijelefeb.pdfIn PDF document text
- https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2b5083a345625b011f5213245a63605d/didizisurelederolegafe.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1db969e679---vepobuda.pdfIn PDF document text
- http://shinies.ru/img/lib/file/28254477448.pdfIn PDF document text
- https://csodamalom.hu/files/files/worifejesakomul.pdfIn PDF document text
- http://fautographie.org/images/userfiles/files/tojififus.pdfIn PDF document text
- http://toyotarent.kr/FileData/ckfinder/files/20210630_FEB8E952EE19B9E7.pdfIn PDF document text
- https://cplastik.cz/data/cms/file/81352760535.pdfIn PDF document text
- https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ade17f0c0f9---genumemixiguxolagotobete.pdfIn PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859571476bc---79971457274.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41d208679---58377642303.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/d2hvmnrneolk378vnd38ede5n7/levogorajazakabuji.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lhhduta0nurnn9njtgl1hr1qt8/wofobokezozoj.pdfIn PDF document text
- https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qp2ut2r7auq31po7aj4b7b9o07/84555456275.pdfIn PDF document text
- http://cuanhomkinhtoanthang.com/media/file/vebetosox.pdfIn PDF document text
- https://auto-rujo.com/images-editor/file/fewinemiwawilal.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aed02d3f11---sazezefuzaxewagixe.pdfIn PDF document text
- http://jamessham.com/admin/usercontent/file/8492246387.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/205075a58ee98ce74d8f8905ef31044e/4915081474.pdfIn PDF document text
- http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8130727223.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738f85ac41d---73327568571.pdfIn PDF document text
- https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a3adb06c3f620e67af84c750fb5cd2b2/78313990834.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d506e8eca9---sepalapowenufurafasip.pdfIn PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ko0bnol508g4re771cc9m20o2u/54450851528.pdfIn PDF document text
- https://ka-base.no/images_content/file/13153522034.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722ad7d582c---64532919900.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=software+development+life+cycle+implementationPDF 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_off00011724.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11724	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012f3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F3B	10952 bytes
SHA-256: `29b76e5a039fa7c06df4263255287329216b5ef2eccfa2e1415777f606986cb4`
`font_02_sfnt_off000148ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x148AD	16836 bytes
SHA-256: `f727b7aae5b5b9ce01b90d34dc81b36672536b2fac9ce14cf1a861e4ed908014`

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