PDF malware analysis — malicious · c8c2248bf5ea9d20

MALICIOUS

PDF

78.3 KB Created: 2021-10-12 10:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 52a30b55bd0ba41484ba0bfcbe943973 SHA-1: e3d3770e66fb2083289b9e7645c40d8eca610b49 SHA-256: c8c2248bf5ea9d20c95b22281f2afcbc82d74e6ac5871229da68aa29c0a1af15

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=four+words+one+picture+answers+7+letters PDF link annotation
- http://jezirka-biobazeny.cz/UserFiles/File/53854358949.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5f938edc---91391517595.pdfIn PDF document text
- http://choragwica.pl/userfiles/file/vafalexibinebunoloro.pdfIn PDF document text
- https://fortworthdental.net/cmsCart/upload/file/davugogewizilitabuxizuz.pdfIn PDF document text
- http://annamsaigonlaw.com/upload/files/49653327226.pdfIn PDF document text
- https://oreopay58.com/ckfinder/userfiles/files/27723151022.pdfIn PDF document text
- https://espritgt.com/userfiles/file/muwiwuwisepadanobobi.pdfIn PDF document text
- http://buyo-g.net/userfiles/file/ruwefegavaxi.pdfIn PDF document text
- http://simp-q.ru/userfiles/file/89529755354.pdfIn PDF document text
- http://eugensa.lt/app/webroot/uploads/userfiles/files/maxukoj.pdfIn PDF document text
- https://www.poole.ed.jp/system/ckfinder/userfiles/files/wetut.pdfIn PDF document text
- http://elliptical-trainers.ru/ckfinder/userfiles/files/38457778450.pdfIn PDF document text
- http://ldkxzzs.com/images/userfiles/file/mawebevuwon.pdfIn PDF document text
- http://falconfam.com/ckfinder/userfiles/files/dakamikafafomajukazutafav.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140baedc413c---54976376212.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kqtup8sst6a1oappj87eds3hqa/bisasozewifi.pdfIn PDF document text
- https://bakotech.at/uploads/ckeditor/files/nurobulexekamosovamap.pdfIn PDF document text
- https://naveenent.com/administrator/imagetemp/file/vujimibik.pdfIn PDF document text
- http://jayeonrak.com/upfile_editor/2021/files/nimuwiv.pdfIn PDF document text
- http://www.scsk12.org/policy/files/files/29541465609.pdfIn PDF document text
- https://vroa.pl/chplusfiles/file/30909436125.pdfIn PDF document text
- http://sor1310.com/userfiles/file/97009308020.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613486ec77473---85361434167.pdfIn PDF document text
- http://bephoangdung.vn/uploads/ckfinder/files/73474844190.pdfIn PDF document text
- https://onthespothousing.com/userfiles/file/nupetapufe.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_off0000cb16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB16	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e328.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE328	17740 bytes
SHA-256: `46eae6576913d5d83902e96fe72712b5716422e5464d66010d70284a0f587039`
`font_02_sfnt_off000110d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110D8	10720 bytes
SHA-256: `fdeeece04bd7351e42fb560b8e7a3673234bc14906e1331d9b033443fae665d9`

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