PDF malware analysis — malicious · 84f8ef34d75b346b

MALICIOUS

PDF

85.6 KB Created: 2021-09-20 13:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: a953def18cd97b693232fab3609b0ad6 SHA-1: 87f43f16223faaefa32509711a7850e0882af08f SHA-256: 84f8ef34d75b346be01df492606faa99b77dc51ba77ff410606b7a216fcd2a49

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or social engineering attempt to trick users into downloading content. The presence of 'utm_term=download' in one URL indicates a potential lure for application downloads. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=download+yoho+sports+app PDF link annotation
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/njmuv2rm33d7sih1svj7t4c2a7/71597864846.pdfIn PDF document text
- https://www.groupe-coelho.fr/ckfinder/userfiles/files/70116793164.pdfIn PDF document text
- https://tideandtigers.com/ckfinder/userfiles/files/48565384066.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/0e0f88c1387d4b6fd1d1fe91b51fc2bf/40540465137.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f592005e---ledobugezupizovirusu.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d169b4ca2e---73065316840.pdfIn PDF document text
- https://excore.hu/ckfinder/userfiles/files/96475294916.pdfIn PDF document text
- http://seoaudytor.pl/userfiles/file/73479964995.pdfIn PDF document text
- http://perfectionistpaintingnj.com/ckfinder/userfiles/files/bakawemapiloxenovidefa.pdfIn PDF document text
- http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5339809057.pdfIn PDF document text
- https://hankilfood.com/upfile/files/wojojikifojoviba.pdfIn PDF document text
- http://residenceraffaellotorino.com/userfiles/files/wugofuratigiwuxi.pdfIn PDF document text
- https://www.pessin-location.fr/ckfinder/userfiles/files/96387345858.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2e69f0e02f0f8b3aaf0cca40d415a158/9844021006.pdfIn PDF document text
- http://artemon.nl/userfiles/file/ripor.pdfIn PDF document text
- https://bela.geekers.tw/upload/file_folder/file/16934985277.pdfIn PDF document text
- https://santehsevast.ru/userfiles/files/45556196319.pdfIn PDF document text
- http://tlxzkj.com/uploads/file/011117573565.pdfIn PDF document text
- http://behtarinekhodetbash.com/files/files/nagejixilinapapegegot.pdfIn PDF document text
- https://netkat.in/ckfinder/userfiles/files/lorim.pdfIn PDF document text
- http://orthocarecentroortopedico.it/userfiles/files/43561457955.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145489acd62e---43851174947.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d8c38ac1226c2edce696c4229e64b06a/worisizipapidobewonidoma.pdfIn PDF document text
- https://combrooncom.com/contents/files/mosopudonubikujige.pdfIn PDF document text
- https://bikidi.com/UpFiles/WebEditorFiles/file/laxuxaragov.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ba04768539c03ad51dea58a809443cb2/2293784465.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_off0000e981.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE981	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010198.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10198	10464 bytes
SHA-256: `57f0e48f7134bcad66bd952fcb1817bd0099c0dd9865a2d938cfa13f3f859a53`
`font_02_sfnt_off0001195a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1195A	18164 bytes
SHA-256: `f692d34c43776283ef79753defe3be66b39cbc0987ede9670aa12ebc923849f7`

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