PDF malware analysis — malicious · cc45a4601bbcc0b2

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 15:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: daa22c818bb49e4d91479914cbcf85f8 SHA-1: d43683d6940a57ebb1f7fa45eef62b4f64d3ff4e SHA-256: cc45a4601bbcc0b2ab6cff152bed299ede25512f03408dbb7980e698986af586

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=feeling+feverish+and+tired+but+no+fever PDF link annotation
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/251cb298ca3287115739fdbedf283c05/kawukagekutonotasomimowun.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/aa9545cb7870fe4e304a0ea2187d74cf/golemijatonafovi.pdfIn PDF document text
- http://secretinvitation.net/images/files/91592264310.pdfIn PDF document text
- http://jngf.cn/files/file/9866987641.pdfIn PDF document text
- http://myexamadvisor.com/fck_uploads/files/nadalebonudosovekugikabe.pdfIn PDF document text
- https://jordanadams.com/ckfinder/userfiles/files/56563186654.pdfIn PDF document text
- http://longarmquiltacademy.net/fckeditor/userfiles/file/figegovokogovukigawelu.pdfIn PDF document text
- http://bidmitt.com/img/files/file/zuderex.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a9568b3d3d---vedexesafoxavexugudukifid.pdfIn PDF document text
- https://emilline.dk/ckfinder/userfiles/files/98556465176.pdfIn PDF document text
- http://614move.com/clients/4890/File/ripewelelatejilezo.pdfIn PDF document text
- http://macphersonproperties.com/clients/876251/File/23044627728.pdfIn PDF document text
- http://smenergy.kr/uploaded/file/15202530806105c85a3348f.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84ecb975f---85885683223.pdfIn PDF document text
- http://zimaletto.com/uploads/file/livakivijupisoxa.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f938d129b0---bapuvi.pdfIn PDF document text
- http://abwrva.com/uploads/files/55015672736.pdfIn PDF document text
- https://www.hsbofmn.com/ckfinder/userfiles/files/dunuvupurolef.pdfIn PDF document text
- http://parkhighclassof60.com/clients/871169/File/86517379138.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e03654538d---diwetezebaxamo.pdfIn PDF document text
- https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/db10e9fa6fe5338faf1a30ae674f0a0d/nemimokatowovunitulam.pdfIn PDF document text
- http://fizjoactiv.eu/Upload/file/11748604077.pdfIn PDF document text
- http://tourhong.com/FileData/ckfinder/files/20210617_B014B85BA2B65E10.pdfIn PDF document text
- https://girl0229960192.com/upload/users/files/momesi.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_off0000ee2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE2F	18528 bytes
SHA-256: `7c2decb117cd4fbd7c5bd874b99280e554e49c59c248cbf1e1a98683ed218dc5`
`font_01_sfnt_off00011e20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E20	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013637.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13637	10916 bytes
SHA-256: `bb01f3828b90f47954cdbbb400a72377abf7151945149d1e93cd21bb1381c96f`

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