PDF malware analysis — malicious · 64e1c3f122b43a15

MALICIOUS

PDF

85.0 KB Created: 2021-08-07 00:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 3ea2884500fecba4d29a5d3d23560cd9 SHA-1: 938c1d49d4b4b27c4e56f043cf3013bc41020cf8 SHA-256: 64e1c3f122b43a15d1ec0a0d85c41e9d4b294ad4f77b1904814b5d1cd2ece99d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic indicates an attempt to lead users to external, potentially harmful, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9834

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 http://jadeite.ru/images/file/takofixavukatuwowaxum.pdf In PDF document text
- http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/sanivapelaji.pdfIn PDF document text
- http://longarmacademy.net/fckeditor/userfiles/file/wibajezoporeved.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609586d7a184b---zokuwoxelevuwebepum.pdfIn PDF document text
- https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099734a34e96---6406049883.pdfIn PDF document text
- http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/507657d85054721ce53a94220bb0ac8a/semopunorunudofijoporapo.pdfIn PDF document text
- http://wmc21.com/ckupload/files/gofanipobogiwi.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a423062e621---gubumuseberetama.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/8508822105.pdfIn PDF document text
- http://trungtinjsc.vn/upload/FCK/file/papakawaxe.pdfIn PDF document text
- http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210718180230.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c6d6f36060---29994955738.pdfIn PDF document text
- https://mosallaesf.ir/uploads/ck/files/lozevud.pdfIn PDF document text
- https://dacinsara.ro/fckfiles/file/73360386716.pdfIn PDF document text
- http://transinfosoft.com/userfiles/file/54768233995.pdfIn PDF document text
- https://securityguardsupply.com/php/uploads/file/87965948200.pdfIn PDF document text
- https://dbjadow.pl/attachments/file/xefesulobejuboxekujufom.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5airtbmbk3mnv9cljrrvkiglm5/68217915434.pdfIn PDF document text
- http://deltools.com/userfiles/file/gilapuvosolomaredidetav.pdfIn PDF document text
- https://thekolkatapackersmovers.com/ckfinder/userfiles/files/zinupejik.pdfIn PDF document text
- http://autohondl.cz/userfiles/file/waguwesodesapexarenogapak.pdfIn PDF document text
- https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/d2ajgght1etm7l47lm3d04e7a4/jazojan.pdfIn PDF document text
- http://zuche0551.com/upload/file/bofipun.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/24379601099.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hsi6gec3o1881brg7gmfrki9fv/83120863034.pdfIn PDF document text
- http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1eab54ea5---budexufumilejejimawalud.pdfIn PDF document text
- http://hanart21.com/files/userfiles/file/80954737669.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=descargar+el+secreto+de+adaline+pel%C3%ADcula+completa+en+espa%C3%B1ol+latino+megaPDF 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_off0000e344.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE344	17628 bytes
SHA-256: `b908dc9a45b97aef99a62385a188bf3ac5f4e7e4e87fb6b37a0f120fbffc0e78`
`font_01_sfnt_off000110c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110C9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000128e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128E0	11228 bytes
SHA-256: `516c62cd500bab051dfbfd80a04bd0ce85505be3b9e8bbd893b2862f819e9ce3`

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