PDF malware analysis — malicious · f3c1ceea1f9cf6d0

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 11:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: f05c24eec34b963a9d913048db5ea1b7 SHA-1: e06d32df991a71338a357cc28e93ba7d7be5efb6 SHA-256: f3c1ceea1f9cf6d09efba8565d455ded4ff3b43ad667e5daad827c750e6f43cb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous 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 support its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=top+pdf+submission+sites PDF link annotation
- https://hostessima.pl/userfiles/file/gofinixajimunevutuveme.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa4770c9c---vetivarenimigi.pdfIn PDF document text
- http://dawahcity.com/userfiles/file/22648248387.pdfIn PDF document text
- https://psfund.org/public/uploads/files/cms_files/71913392370.pdfIn PDF document text
- https://fizjolech.pl/userfiles/file/68474302896.pdfIn PDF document text
- https://fullhousetourism.com/UploadFiles/file/20210606020134100.pdfIn PDF document text
- http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/73299736752.pdfIn PDF document text
- https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9opm84ernto6t12tdb9bu6hbvs/41493550682.pdfIn PDF document text
- https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hui4uo87g4lbr8tdhao3g88385/81921694708.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lfqqg4ul7r3q72c65r24pvn437/17307021401.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b7c4dc1d121e672e47b9126b8f0b0b23/40451855023.pdfIn PDF document text
- https://matskaren.se/anvandarbilder/203/files/tapezopenapelisuxuti.pdfIn PDF document text
- http://drjoecarver.com/clients/49355/File/56817419712.pdfIn PDF document text
- https://keluargamimpi2.com/contents//files/kavarex.pdfIn PDF document text
- http://hasanmasat.com/ckfinder/userfiles/files/gibatuledubeledofigazasu.pdfIn PDF document text
- https://bamfieldrental.com/userfiles/file/tadelosax.pdfIn PDF document text
- https://fullhousetourism.com/UploadFiles/file/20210520014526156.pdfIn PDF document text
- http://alnadaoil.com/userfiles/file/megelazujirigepobusimate.pdfIn PDF document text
- http://ubest.ru/images/file/76493139729.pdfIn PDF document text
- https://nguoixunghekiev.vn/userfiles/file/witolojibim.pdfIn PDF document text
- https://dodatkireklamowe.pl/web/uploads/files/75045240028.pdfIn PDF document text
- http://hopkinshigh1988.com/clients/75739/File/77477999668.pdfIn PDF document text
- http://barudan.hk/UploadFile/file/20210623001759103.pdfIn PDF document text
- http://www.contectrade.hu/fckfiles/file/dujaxowuvagef.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16092c889ccd22---safevalizogujurazegil.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_off0000eb61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010373.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10373	16596 bytes
SHA-256: `cd73845fe537c9eb9ae94d4a4b404147b992dbfb5e79ed5d0d08e47f84b3ed5d`
`font_02_sfnt_off00012e38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E38	10552 bytes
SHA-256: `46cd27df6bc48ebc6d689039b5a43e21c6bfe6254687d508b8a097a4bae2447b`

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