PDF malware analysis — malicious · e6657071ce8fb7a7

MALICIOUS

PDF

84.1 KB Created: 2021-07-06 23:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 004161e53453f407855e47dd88f27a0d SHA-1: 00b187d5d87904b8df338ef6a76536e30e2e1251 SHA-256: e6657071ce8fb7a720ef84e54b9c44beeaee624890dfdd1fa1b06cf6d0ba0f32

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting it is used to redirect users to malicious sites. The presence of these link farms and external URIs strongly suggests a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=android+programming+concepts+pdf PDF link annotation
- http://www.annaleehuber.com/content_files/file/39367815084.pdfIn PDF document text
- https://highrise.pl/file/86732931628.pdfIn PDF document text
- http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d5a505da0b55f9ebfc7db5eb286e99a1/47789698776.pdfIn PDF document text
- http://cameralehiep.com/hinhanh_fckeditor/file/femeborexupawoxojovifa.pdfIn PDF document text
- https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b44c886bf3ef235898d3ca585801bd98/pafevofuxoxok.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d312595f28---gepigukogul.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd51d2fbd---xusalunoxirodikuxesifipi.pdfIn PDF document text
- https://termoformat.md/img/files/84623406271.pdfIn PDF document text
- https://tonitomov.com/picture/file/99915238665.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7b90a9b962e1c0301039821fcd95a9f5/19438880601.pdfIn PDF document text
- https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/90a7960d910689251c6b7f6a6ac91b58/1742226321.pdfIn PDF document text
- https://bestcoloringpages.com/userfiles/file/20323347056.pdfIn PDF document text
- http://sb-78.ru/files/file/59792464006.pdfIn PDF document text
- https://amitadevnani.com/userfiles/file/vuzatapumofekav.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fd48b308e12a3286f51251ef774c131f/11437722654.pdfIn PDF document text
- http://emailreceptionist.net/userfiles/file/40878647413.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/53488353658.pdfIn PDF document text
- http://pokewaveanaheim.com/uploads/files/fadutomax.pdfIn PDF document text
- http://slanfusa.org/clients/47225/File/36548994455.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2c6c7e07a174adc623120ea4134bc64f/28987473329.pdfIn PDF document text
- http://andlupa.com/userfiles/file/vagali.pdfIn PDF document text
- https://olivier-daulte.com/ckfinder/userfiles/files/bomubofavididirifali.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a05da7cc3a6---693317109.pdfIn PDF document text
- http://project-st.ru/userfiles/file/fujigegamoxez.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_off0000e626.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE626	16804 bytes
SHA-256: `d71bd0f4382ccbaf2c27336b0c47bee3018db4619581b80cd049d2ebc4bb6c90`
`font_01_sfnt_off0001120a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1120A	10896 bytes
SHA-256: `c221e004ef999c76451429fda434600db1ee5f67de9f58fc162fba7e6c8df96c`
`font_02_sfnt_off00012b0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B0E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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