PDF malware analysis — malicious · f711b30e6ef4d1da

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 20:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 07926f48c39a50f642626b9ba6eba3e3 SHA-1: 6c7d71fa596d3d2786636e8737fe81d42e45c77a SHA-256: f711b30e6ef4d1da316ca30642c6e4fe3bd27affe463437c53f72e074b2da84c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://crewmak.ru/uplcv?utm_term=computational+physics+rc+verma+pdf PDF link annotation
- http://phanmemerp.vn/attachment/files/nojesejem.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078791e1b59e---3770009997.pdfIn PDF document text
- http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5db1792b---voxasog.pdfIn PDF document text
- https://oncetrabzon.com/resimler/files/7001821600.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fae6a7658---16557985971.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d71c4e8e---79089807910.pdfIn PDF document text
- http://hotelborgodeipoeti.com/userfiles/files/gutisabibisodu.pdfIn PDF document text
- http://dienlanhtruongson.com/upload/files/wugolebabu.pdfIn PDF document text
- http://www.physedu.in/newsite/userfiles/files/gegiramuz.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e8c7a7ac---wejemo.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/36b9be45c9931e0e88dbaea4ea5bf2a5/zazif.pdfIn PDF document text
- https://peptidturkiye.com/ckfinder/userfiles/files/xupukefopegidofililofonu.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ac2da5s0u7q1a46p2kilab9841/90749596753.pdfIn PDF document text
- https://viveironativodevicosa.com.br/ckfinder/userfiles/files/32326700147.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/3f5d9149ae1bc33c28bf28703456c6cc/2933863165.pdfIn PDF document text
- http://acmemask.com/upfiles/editor/files/rusomod.pdfIn PDF document text
- http://schturman.ru/files/files/dadudinazixipixowo.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609da3045396a---lewokirol.pdfIn PDF document text
- http://boathousebrokerage.com/userfiles/file/89750913759.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66eb6d309---63863309215.pdfIn PDF document text
- https://baglab.pl/galeria/file/nerodewufasifaxudo.pdfIn PDF document text
- http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/budel.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c41b115374f---88623761209.pdfIn PDF document text
- http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65622891305.pdfIn PDF document text
- http://allmedicus.com/userfiles/file/gusofakizopuzurep.pdfIn PDF document text
- https://webmakler.org/userfiles/file/6843323436.pdfIn PDF document text
- http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceac507cb9---noxakikebukinogux.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_off0000cde6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDE6	11196 bytes
SHA-256: `6e431626c7354d0684e85457dc64ae60986096fd43661fffc699110e79a59e33`
`font_01_sfnt_off0000e7f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7F0	18204 bytes
SHA-256: `584d4969786b82c3ec8bbcf697067303ada10d4b66550de861092ed71968a876`
`font_02_sfnt_off00011778.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11778	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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