PDF malware analysis — malicious · fdd0ccfe13d4229b

MALICIOUS

PDF

89.9 KB Created: 2021-09-07 05:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: f62da6fd16368e66119f91f4bba796e1 SHA-1: 9adf54a25950cda7a94ea3dcbd08c834bc3c7933 SHA-256: fdd0ccfe13d4229bc6a1519eebbf0f0719a20ae6ebe40506f419e95531c06cd5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a891c550b08d197082621925e22ed3ff/xejuxomewaxetofibi.pdf In PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tosekt7rj3rr24edog6ohbevv6/11389440136.pdfIn PDF document text
- http://abpaluso.com/upload/file/68604906412.pdfIn PDF document text
- http://cauthinh.com/luutru/files/vigidedarirekugelone.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rvefm5b45q4mvlm4vlb1ge4d6b/2248885387.pdfIn PDF document text
- https://ivanda-commerce.hr/userfiles/file/midunowoxoje.pdfIn PDF document text
- http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070684d2f056---tajoji.pdfIn PDF document text
- https://servicepapik.ro/files/mifodowikupatudimudigofu.pdfIn PDF document text
- http://broadgatecapital.com/userfiles/file/tanalumozofupupomesasik.pdfIn PDF document text
- http://www.kroonzuivel.nl/ckfinder/userfiles/files/zinanutusebonujojeza.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609fe15eb9d30---bedamuxe.pdfIn PDF document text
- http://naasschoolofmotoring.ie/fckeditor/userfiles/file/lamisadu.pdfIn PDF document text
- https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/50621508868.pdfIn PDF document text
- http://iccj.jp/images/uploads/fckeditor/file/rokozanurexugura.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7b88b589---85688647073.pdfIn PDF document text
- https://isabellepieman.com/userfiles/file/wikumepitogamopigaloxap.pdfIn PDF document text
- http://htbestcomputer.com/media/ftp/file/88300452024.pdfIn PDF document text
- http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608727ff6ec1f---71826140914.pdfIn PDF document text
- http://aow.infogestnet.it/ckfinder/userfiles/files/9919931044.pdfIn PDF document text
- http://cnc-soustruzeni.cz/files/file/karakoxigovuterof.pdfIn PDF document text
- https://marljivo.hr/UserFiles/files/92048677600.pdfIn PDF document text
- https://pestresolution.pt/site/upload/file/koputinapapugigegojurowub.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161063daaf103e---pamijejuxozinen.pdfIn PDF document text
- http://eltonltd.ru/sites/default/files/uploads/76731090541.pdfIn PDF document text
- http://health-bridge.in/upload/file/258147157.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/bfc484c0b173b85451e370495bec15b4/xegotibonalugadufivoseli.pdfIn PDF document text
- http://reikihaus.com/clients/75291/File/76630753202.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cardiac+cycle+diagram+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_off0000f8e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8E1	18532 bytes
SHA-256: `be621d702d5598bc79a8a613ea8af92cdb607bbdb65abb01336341ae7db40540`
`font_01_sfnt_off00012985.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12985	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001419c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1419C	10616 bytes
SHA-256: `a87f3ca17c0156e9ee0773844a5ccf8677be999150a84c54795538c95bf09c4d`

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