PDF malware analysis — malicious · bc4d92ba5c70a459

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 21:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 8a2d04209826652cc966a0036dda5e46 SHA-1: c960df5ddcd363fbc84c5cbbc8f6dd8ba83b1e71 SHA-256: bc4d92ba5c70a4591331f163e13548780a24f699f285c5790f5e7d49f6a81a54

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicative of a link farm used for phishing or malware delivery. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple external URIs and compromised CMS upload links points towards a tactic of redirecting users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9950

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://laborke.ru/uplcv?utm_term=spoken+english+learn+through+tamil+pdf PDF link annotation
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/03urf18lslfjhk6jld89eb0ceq/58938932841.pdfIn PDF document text
- http://maciejabramowicz.pl/upload/files/file/45089084554.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/909715bab96b5ffe81f53cb9a14a33b1/28055711969.pdfIn PDF document text
- https://bookatowncar.com/userfiles/file/movosi.pdfIn PDF document text
- https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3beebc110f---pakalimotatibafiwuje.pdfIn PDF document text
- http://casavacanzesanvito.eu/userfiles/files/pojoxaribowiv.pdfIn PDF document text
- http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/lesubazuzorinum.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/96c96e98c683af9d486f3d9e3d2afaee/31346034048.pdfIn PDF document text
- http://vipnovini.bg/root/f/uploads/files/walejogunesedebetiguvar.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b714d1be2---25976298026.pdfIn PDF document text
- https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dde6f8716289f163887c76e185bf0500/81529395928.pdfIn PDF document text
- http://carsonpokebar.com/uploads/files/dovozetij.pdfIn PDF document text
- http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb735cb77d---22300021510.pdfIn PDF document text
- http://salkim.com/userfiles/file/bafawo.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/75b7cde152049d86894e656ee8f7b22b/sodonogezibek.pdfIn PDF document text
- http://schodylux.pl/userfiles/file/nufoxawotedaf.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc01e9cb3---tabotukanivozulebababu.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160befe146cf2c---rutonuzawenogox.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/s1oufgfe2d6vrj7hnspi6rhafr/baxagumimefejumakafopil.pdfIn PDF document text
- http://chanhbon.vn/media/ftp/file/befazibiremowera.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ae7e8590---81765676243.pdfIn PDF document text
- http://yachtandgulet.com/userfiles/file/bakijogibedunapaxolemoki.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4e61cd40f60a62653747c9cee718f49e/domim.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/27204013803.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc1313f6c---3226738201.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_off0000b610.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB610	17444 bytes
SHA-256: `fbc63f3014d8367744b1817f0c833f5c60a741f71419a76038e9ba6cbd740502`
`font_01_sfnt_off0000dfef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFEF	11212 bytes
SHA-256: `1712d367fb2351218b2039f88bfc2934ead4b1694540ac5ffe523a6705d955c5`
`font_02_sfnt_off0000f9c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9C9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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