PDF malware analysis — malicious · 9525c0184d38a1e6

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 01:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9ff0f0dca5f4472e45649ed441fdaf01 SHA-1: fc5fd4fee2a283d97cb97bc79b09ccb9409dc740 SHA-256: 9525c0184d38a1e6f68871b8e67f0619a2342cbaba23479122cb35956f33926e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a second-stage payload. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns.

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://krisoc.ru/uplcv?utm_term=china+visa+application+form+pdf+download PDF link annotation
- https://medtek.vn/storage/file/8318694944.pdfIn PDF document text
- https://arerp.kr/data/file///wexavojenu.pdfIn PDF document text
- http://31kouqiang.com/userfiles/file/1627789605.pdfIn PDF document text
- http://wurbs-hanau.de/userfiles/file/18197192398.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/597aae0d20b1c1e609095be9c5e102cb/kejulirufatovunigabako.pdfIn PDF document text
- http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/wotuxopopo.pdfIn PDF document text
- http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/daca1cbc8d6ae066773f0d408919aaf3/domagadu.pdfIn PDF document text
- https://zemiigori.com/uploads/file/kujopesaxepiz.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc248e610---59254100859.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/euv17rjcfu007678cc2dmvpvv8/18602787639.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/5c5pg8irf9qsdhelb9vl9fa667/baxojon.pdfIn PDF document text
- http://sungsam.net/userData/board/file/61424129253.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nlff252gj73ljl048dmo0okq72/dapisamexemiradiga.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609843ed341ac---liwigamumefiwazalenabime.pdfIn PDF document text
- http://studiobardinisrl.com/userfiles/files/fexinesexujetulubojetep.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dfab7d89e77---42369483466.pdfIn PDF document text
- http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9c6687da---25797442718.pdfIn PDF document text
- https://usdcp.jp/user_data/userfiles/files/8957488675.pdfIn PDF document text
- http://booklandbooks.com/userfiles/file/nebedipifuxebo.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1f3c869d07ff6708044a1c2640456260/37312708816.pdfIn PDF document text
- http://olympiad-bigben.ru/ckfinder/userfiles/files/15063079526.pdfIn PDF document text
- http://eco-building.cz/UserFiles/File/87779150391.pdfIn PDF document text
- http://sevimticaret.net/userfiles/file/15358688335.pdfIn PDF document text
- https://andana.us/files/files/fukokewopupusisew.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_off0000dc4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC4D	10936 bytes
SHA-256: `6966c1a7f04b5e85e2805afe0bbda948e6f7cc07932a94c89c7914ce6522db3c`
`font_01_sfnt_off0000f585.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF585	18340 bytes
SHA-256: `d4eb976f002d839d61a40945c9b7abce24a6cf44fee4587aeb6b6d3fa0ee5daf`
`font_02_sfnt_off000124fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124FD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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