PDF malware analysis — malicious · f3fd92868d84b5ab

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 05:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: 837aa773e1a5d9e73390e2c513973b52 SHA-1: 068f05511a6eff44c765efaff8c064759f59405b SHA-256: f3fd92868d84b5ab9b5f7055a90e495aac7a6d0f57f8466e0c57f73720781173

172 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised websites, suggesting it's used to redirect users to malicious content. The PDF link farm heuristic further supports the conclusion that this document is part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9946

Heuristics 8

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf898c601eb---xixosipudu.pdf In PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1e4ce5e85b8f3011b2bcf8e85082de5f/97151142994.pdfIn PDF document text
- https://vieclambaohiem24h.com/upload/files/69622202975.pdfIn PDF document text
- http://ctyrkolky-gamax.cz/data/dokumenty/57179966480.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16091e315e45be---gununanesajifuzeminugaru.pdfIn PDF document text
- https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vo6mnk3hn9ck6idsu1ets458om/33391271313.pdfIn PDF document text
- http://resetimpianti.it/reset/public/file/541393834.pdfIn PDF document text
- http://vandientuchinhhang.com/upload/files/5275769878.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6f28ed5dd38638cf92dc62608d00f175/zovomalurazonimusa.pdfIn PDF document text
- http://yaqeen-eg.com/userfiles/file/9587175319.pdfIn PDF document text
- http://vdadanang.vn/app/webroot/assets/files/88359430031.pdfIn PDF document text
- http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/8447334596.pdfIn PDF document text
- http://cga82.com/admin/File/47533891466.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e1e02d7141274872e336ccbc3961793f/pogiboxu.pdfIn PDF document text
- http://www.toptehnik.si/images/95246348459.pdfIn PDF document text
- http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/45292319984.pdfIn PDF document text
- http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210626091011029688sf29tj.pdfIn PDF document text
- https://cakenepal.com/userfiles/file/texiz.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/32b2dc02de6752fefa06ad8c52c712a0/fimomizoluluninav.pdfIn PDF document text
- https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609faba3592ca---37132380092.pdfIn PDF document text
- http://koszyczarek.pl/userfiles/file/34485785395.pdfIn PDF document text
- https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ipbogvrbkv81fedn1ta0s1unpe/jusirutijufufukomejugafo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=worksheet+on+number+system+for+class+4PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d98d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD98D	16144 bytes
SHA-256: `fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516`
`font_01_sfnt_off0000ef0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF0D	11028 bytes
SHA-256: `ef258cfa27e73ca9758bc106d993bd9dec0ceec4524780c73ab5b976e2ad38ca`
`font_02_sfnt_off000108aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108AA	17524 bytes
SHA-256: `17db5ef0881703256d520ec9f5606b4a2c88651d7213cf97b2f64e28f7b31c0a`
`font_03_sfnt_off00013663.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13663	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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