PDF malware analysis — malicious · 1b3950406e976833

MALICIOUS

PDF

88.7 KB Created: 2021-09-12 01:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 7ed0429791030043c8275eb57676a62e SHA-1: 642abf2a83807e843ea5be8a88b51a7758d36e35 SHA-256: 1b3950406e97683358f445ce8051e3685600fdbb67eadbb852ae1af6c8d2d308

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of using the PDF as a lure to external, potentially malicious, sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://wastran.ru/uplcv?utm_term=demon+slayer+train+mugen+full+movie PDF link annotation
- http://www.cda.org.hk/ckfinder/userfiles/files/fibadimutaseforagezuros.pdfIn PDF document text
- https://chiataiec.com/userfiles/Proj_Name/files/50156744335.pdfIn PDF document text
- http://hoadondientu-ptp.vn/images/ckeditor/files/gopaniwegujikodotolabebop.pdfIn PDF document text
- http://tourhong.com/FileData/ckfinder/files/20210905_94C88C88656BB086.pdfIn PDF document text
- https://es21sys.com/userfiles/file/13996931276.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327462e5e14---23880685235.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a6b000ffe84b82a98eaaf4afdfc1d106/79780061023.pdfIn PDF document text
- http://chaitraglaze.com/uploads/35802110479.pdfIn PDF document text
- https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/parupadu.pdfIn PDF document text
- http://ylpqzl.com/ckfinder/userfiles/files/8919969366.pdfIn PDF document text
- http://land89.com/ckupload/files/weminibepo.pdfIn PDF document text
- http://www.romanschatztruhe.de/img/files/78747160700.pdfIn PDF document text
- https://inprovitperu.com/ckfinder/userfiles/files/42556710785.pdfIn PDF document text
- https://12tiga.com/contents/files/fumagatolu.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d0bc068194ead4078bd5816f46a83ca1/11690413551.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af942d4ee5---sikavafeso.pdfIn PDF document text
- http://tobn56.com/UpFiles/file/lelumibixinarixefusisave.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137896f5284d---75744684783.pdfIn PDF document text
- http://emailreceptionist.net/userfiles/file/75017776147.pdfIn PDF document text
- http://plymouth-logs.co.uk/ckfinder/userfiles/files/50509876443.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/q51e8pm2gh80k4g4lqi23jg5o3/9412558023.pdfIn PDF document text
- http://thuduchouse.vn/pics/file/pipejutavexisibuxefisuz.pdfIn PDF document text
- http://metafelix.it/userfiles/files/megojatepezifapafid.pdfIn PDF document text
- http://lineshare.net/upload/files/20210905164939.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_off0000e7f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7F7	10840 bytes
SHA-256: `a8fb133a134def3a6e5f442b7723fc8e301660bdaff0d71e4ebfb1414af15f39`
`font_01_sfnt_off0001010e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1010E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011920.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11920	23048 bytes
SHA-256: `7bd0421cb9dbae49410b903f4d078a5c4636b61fe142631850e1af96fe975b16`

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