PDF malware analysis — malicious · d6ad8f4fd4b0255f

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 19:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 8667337d21d175fbb71b45123531fba9 SHA-1: 144e4f45e2bee1dae7746dd8041a3b0ff55fed52 SHA-256: d6ad8f4fd4b0255f240a6e6af55f366e07fe71745210c1ee3e89ec4f39ccaa13

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to compromised WordPress sites, suggesting a link farm used for distributing malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=download+minecraft+java+edition+1.16+android', are likely used to redirect users to download malware disguised as legitimate software.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://nomylo.ru/uplcv?utm_term=download+minecraft+java+edition+1.16+android PDF link annotation
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f976560e88---bolitarak.pdfIn PDF document text
- http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/6291c9efcfbe184708e6d92815ddb25d/mobexotuviwerotaxilidetuf.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/093a738aa64fe84228097d811ed4a705/8465942361.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/62fbdb82868cf69b6565fdc49517e725/22637597860.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9f5b3deccf5a2702a88405e29dae101c/timudikojopod.pdfIn PDF document text
- http://nfc.soo.jp/file/punadezijufomotuzasidaw.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcfd9cb689---59769930452.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090d9283ab17---18205433446.pdfIn PDF document text
- http://alexanderkanevskyartistbiography.com/clientMedia/file/79734703780.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705d565a5dc---73894436244.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b306dcc828c---98441149731.pdfIn PDF document text
- http://www.urbanwaterways.info/files/nazetexuxezetarapipi.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a403518770e---duninojenudekalow.pdfIn PDF document text
- https://bawwabatrizq.com/userfiles/file/54067019667.pdfIn PDF document text
- https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/844308dfb3330d03bd20b6f35b601f14/matakadejo.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e754.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE754	5452 bytes
SHA-256: `689da2e1557232b73385ae3a659ca9dd1b792bc4663e3c102d6344d2a3f5d715`
`font_01_sfnt_off0000f9f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9F4	1860 bytes
SHA-256: `41b1d91aac0987b562aaaddd11767cbb87a1bc25424fcb470778cc58c6407b56`
`font_02_sfnt_off00010306.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10306	11476 bytes
SHA-256: `b35eb3fee3571a87c2be1fbbfcbaf6941334682bdbd331f40fda9f38c8878bef`

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