PDF malware analysis — malicious · 50f4bf4f11185327

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 02:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e10b77bcb1a6a27642120439d5058faf SHA-1: 2bf8d71b11f7f9eedc5dab9fb13d75ff29f09fb3 SHA-256: 50f4bf4f1118532765289c9f03eb68fd919c98c8f66d9888e31475e4994221d0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9737

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://medvor.ru/uplcv?utm_term=up+police+2018+exam+paper+pdf PDF link annotation
- https://eletvital.hu/uploads/files/sefuxafudinawutoxikove.pdfIn PDF document text
- http://pixel-pro.ru/upload/file/81424989755.pdfIn PDF document text
- http://gzky.cn/dubeite/ckfinder/userfiles/files/20210826_121909.pdfIn PDF document text
- https://eurouniversal.eu/ckfinder/userfiles/files/84866422160.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f3a1018f---7741302003.pdfIn PDF document text
- http://wintec-samu.hu/uploads/files/vufimi.pdfIn PDF document text
- http://kp-technik.cz/ckfinder/userfiles/files/ziderefu.pdfIn PDF document text
- http://eros-arena.de/eros/userfiles/file/69067122211.pdfIn PDF document text
- https://alubiasdetolosa.com/files/galeria/files/tirazo.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3faec821---xabikixakeregigewokiw.pdfIn PDF document text
- http://aal.tw/uploads/htmlupload/files/kologemuxezokepexivatesaj.pdfIn PDF document text
- http://ritadas.in/userfiles/file/55199097766.pdfIn PDF document text
- https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cec5bfc6b---turivazidedekazulebetewuw.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/q3hrm72pdh5fhv6gse8feo68b2/fenuvujebapi.pdfIn PDF document text
- https://zhavezbozi.cz/data/file/fimariledefixikijixe.pdfIn PDF document text
- https://nangluongvada.com/uploads/files/rolumadosowukav.pdfIn PDF document text
- http://aromaonly1.com/yamituki-n/uploads/files/76944055801.pdfIn PDF document text
- https://x-software.cz/data/file/ferapegadapavod.pdfIn PDF document text
- https://www.ftha.org/admin/ckfinder/userfiles/files/41661263839.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be6ff52218e---27301803606.pdfIn PDF document text
- http://siciny.pl/userfiles/file/7862931803.pdfIn PDF document text
- http://ilksolar.com/Images/Media/files/tizumuvigetovofuwutemakaf.pdfIn PDF document text
- https://sport-jicin.cz/dokumenty/2750646729.pdfIn PDF document text
- https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/9b8721c0acf89bb7fe95cc94106adf8d/77471153781.pdfIn PDF document text
- https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/be4a62fbe5db0c95e7862837697812e3/xisudibasamugoxig.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d751a48f2d2---sobimovet.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffc4ec615---42994950119.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b5c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB5C3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cdda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDDA	11020 bytes
SHA-256: `b53f1aad0389ed3f3ffc044a80d6918a8bbb30e1db39cec7324986d0818e364f`
`font_02_sfnt_off0000e789.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE789	17368 bytes
SHA-256: `46deeb7df7be5121a01837238a1d73fb21cfde704d8c8636371b86e9d949da83`
`font_03_sfnt_off000112fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112FA	1680 bytes
SHA-256: `6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc`

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