PDF malware analysis — malicious · 5f80b10b9575d94c

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 09:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: aea0b07a98491067da6809e443c537f9 SHA-1: aede45343d4d75d5ce312489e88615b25df30fad SHA-256: 5f80b10b9575d94c54085c645a6738676fb031dde7881d028f7a16c8a833dadf

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the numerous embedded URLs pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://irlanc.ru/uplcv?utm_term=how+to+make+your+own+vpn+server+on+android PDF link annotation
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3a6612aabf6713731e087f5a3629a965/50519194086.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/464cc13729f6de480a8361667a3bcea0/41915317572.pdfIn PDF document text
- http://ylplj.com/ckfinder/userfiles/files/78522287186.pdfIn PDF document text
- http://haiqi-machine.com/d/files/98331070364.pdfIn PDF document text
- http://gangwonbnb.com/FileData/ckfinder/files/20210901_078C6BA6274FD2A9.pdfIn PDF document text
- http://enovosti.info/ckfinder/userfiles/files/69595845972.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe876a6263---kosafada.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143192b65c90---fawuginiwagefaserozata.pdfIn PDF document text
- http://cx-gl.hu/images/files/zuboz.pdfIn PDF document text
- https://adproissy.emailingmanager.com/uploads/editor/file/97098266569.pdfIn PDF document text
- https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/junarubitumozasanamemu.pdfIn PDF document text
- http://fkjz.cn/upload/files/2021/09/202109051500204126.pdfIn PDF document text
- https://bdata.vn/upload/files/kanilajulomijexa.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0796720f6defda32065546626284c88f/7324549514.pdfIn PDF document text
- https://faguaflowers.com/images/admin/file/57325303795.pdfIn PDF document text
- http://ssanadia.in/userfiles/file/mapisubejedeg.pdfIn PDF document text
- http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/gopake.pdfIn PDF document text
- https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3272ccf4efa1ece772c52e48e0dbbe38/7752563431.pdfIn PDF document text
- https://mauspro.net/upload/files/nufimop.pdfIn PDF document text
- http://ccforum.kr/uploads/file/1631311467.pdfIn PDF document text
- http://keystoparadise.com/userfiles/files/59058158963.pdfIn PDF document text
- https://vr-spagna-20.effievirtual.com/galeria/files/mubum.pdfIn PDF document text
- http://agisma.ru/files/pages/files/teranukubujegulu.pdfIn PDF document text
- 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_off0000d5f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5F2	10956 bytes
SHA-256: `37c57a3f3a51904972aa19d8cf9f5dbf016d4c8b02d6bf79a2b5ef165c8bfa42`
`font_01_sfnt_off0000ef62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF62	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010774.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10774	18136 bytes
SHA-256: `ccc0b16def9eb30669b1fb6cee1300daea38aa27f3e23694a079d8b6a7512636`

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