PDF malware analysis — malicious · 384a441ba86571a2

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 00:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 43df5d4c512fcc7d0076dd403c9fd67c SHA-1: 5cf129a9c7141f959e8459740952f74042ac78fc SHA-256: 384a441ba86571a27e22ff640f21b0d1898167a7c8339a0eeb28eea84fc00beb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and a link farm designed to redirect users to potentially harmful content. The document body is unreadable, but the heuristics indicate a strong likelihood of malicious intent through URL redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://krisoc.ru/uplcv?utm_term=pounds+per+square+inch+to+newton+meters PDF link annotation
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/efdc6c832c3352ee1700477017069495/36137247461.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e893825d04---69760495209.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091acaf7cc2c---netikosapezolepiboxuwaner.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160806c5c638c7---muzitewunobatuduruv.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb48f78439---vulepuwazigagiriseruxo.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44977a3633---71677934934.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee605802a51---vunamefejosejazazi.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ce89f527e191afa223cf38419b63e320/pikibisitomawomufofomab.pdfIn PDF document text
- https://yukkumpulgroup1.com/contents//files/ravavobigoxusodasugi.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c90c3a049---tonebojanavipufa.pdfIn PDF document text
- http://dmhu.eu/uploads/uplib/file/zevuxujuwujurolepu.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8c4502597934dbac4174a691a40cb426/42258933337.pdfIn PDF document text
- https://alkirbilaw.com/userfiles/files/sujawinenuvolimepexanotes.pdfIn PDF document text
- http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16211810221791.pdfIn PDF document text
- http://4seasonstours.in/userfiles/file/12577803561.pdfIn PDF document text
- http://project-lovcen.me/userfiles/file/26992233185.pdfIn PDF document text
- http://icbiz.ru/userfiles/file/86891112795.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d352568b4---wemod.pdfIn PDF document text
- http://9meclinic.com/ckfinder/userfiles/files/ruruxekizotif.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ac0305b8---sukefigabepuzivubadupig.pdfIn PDF document text
- http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/15559243218.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dfeebdfae8---60545245121.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/45473517654.pdfIn PDF document text
- http://anbao.vn/uploads/userfiles/file/rusirovazow.pdfIn PDF document text
- http://geofer.eu/userfiles/files/wigesakusinikalamujurowi.pdfIn PDF document text
- http://laclonghotel.vn/upload/files/lovagotuzaxodupedujuzi.pdfIn PDF document text
- https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cdb70bfa592c1d502c6e66076736da92/6492985283.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_off0000d71e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD71E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ef35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF35	11064 bytes
SHA-256: `6c0b9df569e87fc3645c7d6362989b5a229ce5cc22f6b126bddeafdeff86a0df`
`font_02_sfnt_off000108ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108AE	16856 bytes
SHA-256: `05faa9edca8f5a87c9e646efb6c207d2c2a635a09346f2392a48ff6411071378`

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