PDF malware analysis — malicious · 156ee9fe1aaa4d13

MALICIOUS

PDF

113.6 KB Created: 2021-06-27 00:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: 43af776cfff0d045e36fac04854687c6 SHA-1: 0de19d59c7d93db0690d4b97529cca2d8891c210 SHA-256: 156ee9fe1aaa4d13a46038286fc883dfb246cb9d343bed8ed60b2950a6ae9582

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of external URIs and the overall structure suggest a lure to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9950

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160905d2b69e18---piwajaraselaganapav.pdf In PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/77d062715a521cde8e0710e00ee8d575/93565476519.pdfIn PDF document text
- http://iaestedresden.de/userfiles/file/16358245025.pdfIn PDF document text
- https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5m6hvaf2ppbmoaqqh0nppm039s/47063984771.pdfIn PDF document text
- https://diedacorporation.net/freesiafiles/file/58898890029.pdfIn PDF document text
- http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3432c5efc9cff53a6c12d37c2baa17f9/84585395827.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd26e9561b---75549779592.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160893b38cee9b---2366785729.pdfIn PDF document text
- http://klefmarken.se/upload/file/83199876541.pdfIn PDF document text
- http://blissrenewbeauty.com/newerac2c/userfiles/file/borovepupuzizopeteduwu.pdfIn PDF document text
- http://rentbucharest.net/images/userfiles/5424304969.pdfIn PDF document text
- https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/01b7166b2b0aae5efd7d5e3f19482c38/63232622313.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a29d0d8633e33b558f82e0dddf342f62/xamoja.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2132fd93c6e519add95ee23d3d61850c/54823604380.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7ef49ad90e9e45ddb3fefd5c52a00f5a/xezatamulaze.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba66d7343e4---16692908261.pdfIn PDF document text
- https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/29f759dc138754dc70fc0dcf6c00b8b2/66963801769.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4a8969d82333b7521ae0c9ea93b82cc2/19795311300.pdfIn PDF document text
- https://gomaihoa.net/upload/files/73652979444.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5392c37d9---49865777388.pdfIn PDF document text
- https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607186b6bfcf3---karakerugikas.pdfIn PDF document text
- http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160abd63ed839b---2653156109.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c07faf81c36---wopalunapalupiw.pdfIn PDF document text
- http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b6435e6d0e9---1608902992.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=duval+county+jail+searchPDF 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_off00015e16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15E16	16444 bytes
SHA-256: `d966d673d1fedd3011e6628409446127a4c0f2c464575887ab7108762cd676a5`
`font_01_sfnt_off000188a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x188A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001a0b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A0B8	10740 bytes
SHA-256: `9a9811a867e646f6393751dfcc275768a031a4e49925c124e1cd26ebbf4647fc`

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