PDF malware analysis — malicious · 0927f051a582d5c3

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 09:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8ed35238f9c8bef348722414ed9cf087 SHA-1: 718add1c27051b4a35b99a743a12cfa0be1804f5 SHA-256: 0927f051a582d5c369b80682818d68471b8eccd61287d3bec24ef86a35225782

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of external URI heuristics further supports its role in directing users to potentially harmful external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=akai+lpk25+user+manual PDF link annotation
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8c2ptqio8eo2id27lcjttdlnes/1086982967.pdfIn PDF document text
- http://insidethedigitaltrend.biz/userfiles/file/68035156422.pdfIn PDF document text
- https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cdafb9963a---36502864871.pdfIn PDF document text
- http://ecole.ru/text/images/file/9300394611.pdfIn PDF document text
- https://suthuytinh.com/app/webroot/uploads/files/99673564073.pdfIn PDF document text
- http://3colorjazz.com/fckeditor/userfiles/image/paxaduwelumavizerilo.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/escqatbocpc0e1l24elk6bphn2/rimifajofudesejobi.pdfIn PDF document text
- http://chandigarhdatarecovery.com/files/file/81390107411.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fa619cd059957b74564a72bc2d62f4e0/nisusefajekaribivido.pdfIn PDF document text
- http://elitaliaweb.it/upload/file/70859901186.pdfIn PDF document text
- https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3507148a2aadb3c03fb9f252097f6f8b/31244364858.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/51618007290.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0533bdab079a8da75b2b9fa7f54cf595/33015775079.pdfIn PDF document text
- http://kulturazebrak.cz/userfiles/26907789280.pdfIn PDF document text
- http://rotarylaspalmas.orgdocumentos/file/81653408992.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba589d0bad---87408254570.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d862912b970b3a405d1b278d00a16a67/83743003379.pdfIn PDF document text
- https://mertlakustika.cz/images/pages/file/86800624942.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/joohd0mjtt4hmsb66j756n7dbn/gadejofixinodedovexap.pdfIn PDF document text
- http://bcslaw.hu/admin/fck_upload/file/ziwutefalokomavenemin.pdfIn PDF document text
- https://imotrading.com/images/userfiles/8405541022.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823044dfea7---81940486234.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793304d8312---40427314809.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_off0000e8aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8AA	10624 bytes
SHA-256: `79beb92094b65798f45139a62d7e4d3bb1894b82e4b764bde3282fea9166a64b`
`font_01_sfnt_off00010107.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10107	18052 bytes
SHA-256: `e50ebf17f61df690ae27f0e2e4e184a6a959ebbf7cbea5c132ae6a2b9cb7d986`
`font_02_sfnt_off00012fd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FD0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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