PDF malware analysis — malicious · 435db87b0928796f

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 00:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: adeaae45c3658ebbc279766dfd9a58bf SHA-1: ca96fdb656b55f8af67bdcb6d925608391225546 SHA-256: 435db87b0928796f08386c5274168ac36730ff33a98abe2ba3aa04cfce3520ed

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites. These sites host PDF files, suggesting a multi-stage attack or a phishing lure.

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 http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b1663566---gafafipizul.pdf In PDF document text
- http://hsi-international.com/ckfinder/userfiles/files/wejorebilupidoxibov.pdfIn PDF document text
- https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/2f1abda2787b5f9af3d8b66423f1bc86/gojisuxosogujamujewemib.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab627038852---vobewubibozupotan.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/08dc02c0de418af2b4b075ff14183562/kebimuwizum.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/27e6deb572206d86abe7199385558778/kepajujidisevezujiwad.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2ea4c96ce155ff0b940c689ab9e58a45/68813926092.pdfIn PDF document text
- http://3dtechgroup.com/uploads/image/files/80463325791.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160869d06d7502---28612977263.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b870cef227b---vetirozibapomexowix.pdfIn PDF document text
- https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jqrrbg1rk04or5uhof3dv3b286/rikipim.pdfIn PDF document text
- https://planet-for-events.de/userfiles/file/lowiwuniwaburuporijegewud.pdfIn PDF document text
- http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/54540577864.pdfIn PDF document text
- http://henghuitong.com/jingkelun/userfiles/files/20210709073533.pdfIn PDF document text
- https://angkoronetour.com/userfiles/file/31372479820.pdfIn PDF document text
- http://rilta.net/userfiles/files/13030772539.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ea84f43ef1c3d50b80c467536b568806/48373602411.pdfIn PDF document text
- https://arte-salon.ru/upload_picture/48212631960.pdfIn PDF document text
- https://easypayindia.in/userfiles/file/dukaxopezaxaru.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d73ebccef---53620317560.pdfIn PDF document text
- http://matsonconstruction.net/userfiles/file/vigenelekumilawupim.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0b4d93ac---tebufexof.pdfIn PDF document text
- http://doks-films.com/pcms/content/file/bozowop.pdfIn PDF document text
- https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/seligarajuxudodegawafipoj.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ah0v4684mv41adu7e78b8fars6/11993763547.pdfIn PDF document text
- http://rudolphalexander.com/uploads/files/nakukom.pdfIn PDF document text
- http://webbyshoe.com/fckeditor/userfiles/file/dosukisilifiwelaj.pdfIn PDF document text
- http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b899cf4bf49---55762134634.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=turista+mundial+instructivo+pdfPDF 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_off0000ce4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE4D	10780 bytes
SHA-256: `8e76e57c6256583e98b3fc2d0d5c979d49fb4209e7033c038a28ab4fabf916b3`
`font_01_sfnt_off0000e725.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE725	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ff37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF37	18816 bytes
SHA-256: `99cd3fe190b2fff534b32f5518e81328437ca8d8e307f347c63eee2146c9e0a9`

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