PDF malware analysis — malicious · bd41307e43132354

MALICIOUS

PDF

94.7 KB Created: 2021-09-12 16:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e9b65f4ff4f907eedc7c87255f70642f SHA-1: 768eacd400305073fe05f8aacc78fe10b05a2623 SHA-256: bd41307e43132354c42ffc6007dd1b76472107656b5eef5770d90abb07ad6cf7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing embedded URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9888

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://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5c044744dc931cefdeeb5424d6d3a336/7443953542.pdf In PDF document text
- http://conganbacgiang.vn/app/webroot/uploads/files/tifatejamuvupajudulajof.pdfIn PDF document text
- http://yoron.net/up/files/25325847447.pdfIn PDF document text
- https://mavachhaiphong.com/upload/files/vivujapovufuxisakagojav.pdfIn PDF document text
- https://machnik.net/ckfinder/userfiles/files/guzukosuperisorip.pdfIn PDF document text
- http://karthikeyanjayaram.com/userfiles/file/sidojiw.pdfIn PDF document text
- http://sziszolg.hu/editor_up/29710477942.pdfIn PDF document text
- http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/52122280357.pdfIn PDF document text
- https://a-pointpro.com/cms/ckfinder/userfiles/files/kukidufukewalipadokedokin.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/47f05e90846a5727c69fb385d987e5fc/70170581792.pdfIn PDF document text
- http://mea-travel.pl/userfiles/file/75045062724.pdfIn PDF document text
- https://rintrans.com/files/74350453964.pdfIn PDF document text
- https://chilegastronomia.cl/uploads/userfiles/files/viduliwofemu.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/belenanaseponasokejiw.pdfIn PDF document text
- http://krcatikyonetimi.com/userfiles/file/mizipa.pdfIn PDF document text
- https://mabuksusu.com/contents/files/gokorurawakemokoj.pdfIn PDF document text
- http://aalzkj.love-mrt.com/upload/files/jususenemuvunirebede.pdfIn PDF document text
- https://buffinvestment.com/upload/ckfinder/files/46439339770.pdfIn PDF document text
- http://www.hussco-steel.com/husscofiles/files/tovurupododojiwajused.pdfIn PDF document text
- http://shiny-baby.com/fileimage/file/29032353684.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da1d253a3---fuxisemaxufujobawakevivef.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/lomedozemubuliresifatol.pdfIn PDF document text
- http://vongtaygiay.net/media/ftp/file/24907407866.pdfIn PDF document text
- https://nsck-cykelmotion.dk/ckfinder/userfiles/files/2595061446.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bonexifamif.pdfIn PDF document text
- http://wefocusdesign.com/upload/files/60101544548.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=freaky+full+movie+123PDF link annotation
- 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_off000108f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108F9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001210b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1210B	19636 bytes
SHA-256: `a5c5dbb598e78e353863e3d07963100b3b933ebfbe4dc8fb8b55b8b155de9bf9`
`font_02_sfnt_off00015437.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15437	10700 bytes
SHA-256: `c8dc5bac04c6c5b6354a345d2263661e8f641cb1be8d7038b487e19ebb5ebcac`

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