PDF malware analysis — malicious · cbb8fc0be9f81a8d

MALICIOUS

PDF

86.2 KB Created: 2021-09-16 22:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ac51b142fa3189cc7bdacea1b1790f86 SHA-1: 3bfa6a396dac8545c8d96de1c64adb738ba52f85 SHA-256: cbb8fc0be9f81a8d28e742b1115f1c97e5355600192da0a6beeadbd37b357d86

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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=how+to+hide+pictures+on+android+phones PDF link annotation
- https://aluminiosarla.com/userfiles_arla/files/velozuvivumekatez.pdfIn PDF document text
- http://baraanduliaptti.org/userfiles/file/lufodoporowogozes.pdfIn PDF document text
- http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/kabusofezulebarijaxe.pdfIn PDF document text
- https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dbe5532d7d1e1600f49f1d4e82fdd356/gasovid.pdfIn PDF document text
- http://timebymtm.com/upload/files/dugatuvixukiso.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c965cb2c---xarewanokeposesemewi.pdfIn PDF document text
- http://cpviettin.com/upload/files/maludupupobepupif.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142106c5ef0e---94811909696.pdfIn PDF document text
- http://pravkniga.ru/files/userfiles/files/pamokede.pdfIn PDF document text
- http://flywings.sk/UserFiles/file/21990716391.pdfIn PDF document text
- https://ubitanduk.com/contents/files/29043718262.pdfIn PDF document text
- http://e-district.org/userfiles/file/15337413038.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/29dc5fc74fe457d3926680ffe2c7bc13/kimojuwifupaxinodab.pdfIn PDF document text
- https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/19299781136.pdfIn PDF document text
- http://tovicetour.com/FileData/ckfinder/files/20210909_9F167FD470961435.pdfIn PDF document text
- https://atlaskvartir.ua/data/uploads/files/kuponavozomas.pdfIn PDF document text
- http://dekoblickfang.de/userfiles/file/14593264723.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0cfcaebe0d7e24fc1b845b57aea02060/penaravivijimulexuwifusiw.pdfIn PDF document text
- https://inprovituruguay.com/ckfinder/userfiles/files/87731188790.pdfIn PDF document text
- https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/58033407629.pdfIn PDF document text
- https://interno-kazan.ru/upload/files/wesidadawizezedisufotirub.pdfIn PDF document text
- https://china-glass-mosaic.com/userfiles/files/20210905_011202.pdfIn PDF document text
- http://abwingssuffolk1.com/uploads/files/43787613505.pdfIn PDF document text
- https://suma.ca/upload/editor/file/40835223385.pdfIn PDF document text
- https://leuphuotcamap.com/uploads/image/files/57035613103.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_off0000eba7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBA7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000103b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103B9	17656 bytes
SHA-256: `66dff20897272b561591715d578b69760c4866d2d5d1d0e5bb7e26a244ccb9a9`
`font_02_sfnt_off000131f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131F6	10740 bytes
SHA-256: `1c7ab2332a74c1aa116866b0421ba75dcbc2b6be71a5f0d49f17991ca6759261`

Open this report in the interactive analyzer, or submit your own file for analysis.