PDF malware analysis — malicious · 381473d99e444a1d

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 08:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 697b74225c98b234367466fb422541c6 SHA-1: 642e328f15e0789669f02f3020874d0aa268fa55 SHA-256: 381473d99e444a1d7eda40675f57367741db87fe7d64cd475e5295a91fe86a27

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a downloader for further payloads. No scripts were extracted, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=cars+confiscated+by+police+for+sale PDF link annotation
- https://mangmalungtea.com/userfiles/file/52897659312.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b39a3970c---32707643764.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/57439282803.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0d3eec66---nurab.pdfIn PDF document text
- https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/20b5b80b15cf05be83f5143e6ffb9a95/30460791984.pdfIn PDF document text
- https://we-plus.tw/ckfinder/userfiles/files/29807738743.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba014e02e49---dubozaliwoti.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160880413a6b21---91672815817.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/59dc14314d9fb044fb337ada46f864b8/pomuwikevajakavedobavoton.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a30cf2ab---kuxenujokigufa.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608678334f716---vekuzimunimalifenobuna.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1bd1e8f20---45779390275.pdfIn PDF document text
- https://dbjadow.pl/attachments/file/7127585435.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ssohed0kdgtq7ji08ortu900cb/julevusuf.pdfIn PDF document text
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea54b246a6---tunirexes.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2eaab503e5aed5d597ace26d38167ab/zaxewivigumob.pdfIn PDF document text
- https://nguoixunghekiev.vn/userfiles/file/71256779795.pdfIn PDF document text
- http://kythuatviet.vn/uploads/userfiles/file/pipevukurebus.pdfIn PDF document text
- https://numberonerevolution.it/file/tefanudejigojo.pdfIn PDF document text
- https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4chpk0ri91pkp6o439hcfsj53d/fonawiworilitofapogajimu.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743df7d2843---golisemavujoxapejasix.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6ad9c04c---38560951108.pdfIn PDF document text
- http://eakqshop.com/ckfinder/images_store/files/72562058496.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbb1baf9c---notatalile.pdfIn PDF document text
- http://dlikefulproductions.com/clients/875850/File/56200414643.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_off0000f222.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF222	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010a39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A39	10900 bytes
SHA-256: `fc60f264a02b4345f89748022382f484cf8fd17071b509b534a77b0dd147d0aa`
`font_02_sfnt_off0001235e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1235E	16396 bytes
SHA-256: `623a0120347ec633446907b086685a6ddec87e5ab21d3106f575b84bb6739145`

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